List of scheduled monuments in Monmouthshire

Monmouthshire has 200 scheduled monuments. The 46 prehistoric scheduled sites include burial sites, enclosures and 16 hill forts. Ten sites date from the Roman period, including four villas. There are four early Christian sites from early medieval times. The 101 sites from the medieval post-Norman period include spectacular castles and hidden castle mounds, remote dwellings, grand abbeys, holy wells, stones and churches. Finally the modern period has a 39 sites, including a very wide range of early industrial activities.

Scheduled monuments have statutory protection. The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the Welsh Government.^[1] The list of scheduled monuments below is supplied by Cadw^[2] with additional material from RCAHMW and Glamorgan-Gwent Archaeological Trust.

Main article: Lists of scheduled monuments in Wales

Scheduled monuments in Monmouthshire

Image	Name	Site type	Community	Location	Details	Historic County	Period^[a]	SAM No & Refs
	Gray Hill Stone Circle	Stone circle	Caerwent	51°38′16″N 2°48′49″W / 51.6379°N 2.8136°W / 51.6379; -2.8136 (Grey Hill Stone Circle), ST437935	Fourteen visible stones, nine of which lie on their sides end to end, forming a circle. Possibly curb stones for a burial mound, or a stone circle.	Monmouthshire	Bronze Age	MM031 ^[3]
	Thornwell Farm burial mounds	Chambered long barrow	Chepstow	51°37′17″N 2°40′02″W / 51.6213°N 2.6673°W / 51.6213; -2.6673 (Long Barrow and Round Barrow at Thornwell Farm), ST539916	Two burial mounds now within a Chepstow housing estate. One may be a Neolithic long barrow, with stone chambers. The other is a Bronze Age round barrow.	Monmouthshire	Neolithic	MM206 ^[4]
	St Peter's Cave	Cave	Chepstow	51°37′53″N 2°40′04″W / 51.6313°N 2.6677°W / 51.6313; -2.6677 (St Peter's Cave), ST538927	A very wet cave under the cliffs of the Chepstow Bulwarks	Monmouthshire	Prehistoric	MM160 ^[5]
	Llangibby Bottom Standing Stone	Standing stone	Llangybi	51°39′46″N 2°53′50″W / 51.6628°N 2.8971°W / 51.6628; -2.8971 (Llangibby Bottom Standing Stone), ST380963	The 1.7m high stone is in 'Priest's Meadow', and is claimed to be the spot where St Cybi pitched his tent when arriving in the 6th century. Also known as Waen-y-'Ffeirad.	Monmouthshire	Bronze Age	MM106 ^[6]
	Heston Brake Long Barrow	Long barrow	Portskewett	51°35′41″N 2°42′55″W / 51.5946°N 2.7154°W / 51.5946; -2.7154 (Heston Brake Long Barrow), ST505886	Evidence of a significant neolithic chambered tomb or long barrow. A small group of puddingstones mark the entrance of the site. Human skeletons, cattle bones and some pottery were discovered in the chamber when it was excavated in 1888.	Monmouthshire	Neolithic	MM018 ^[7]
	Llanfihangel Rogiet Standing Stone	Standing stone	Rogiet	51°35′10″N 2°48′08″W / 51.586°N 2.8022°W / 51.586; -2.8022 (Llanfihangel Rogiet Standing Stone Lane), ST445877	A triangular tapered standing stone, 2.4m high, and 1.6m by 0.5m at the base. Also known as The Devil's Quoit.^[8]^: 152	Monmouthshire	Bronze Age?	MM068 ^[9]
	Gaerllwyd Burial Chamber	Chambered tomb	Shirenewton	51°40′00″N 2°48′00″W / 51.6667°N 2.8°W / 51.6667; -2.8 (Gaerllwyd Burial Chamber), ST447967	A portal dolmen with eleven conglomerate stones, some standing and some upright, supporting a large capstone.	Monmouthshire	Neolithic	MM013 ^[10]
	Harold's Stones	Stone alignment	Trellech United	51°44′34″N 2°43′36″W / 51.7427°N 2.7266°W / 51.7427; -2.7266 (Harold's Stones, Trellech), SO499051	Three large monoliths, made of puddingstone, aligned from northeast by east to southwest by west. Local legends say that the stones were thrown by Jack o' Kent from the summit of the Skirrid, over twelve miles away.^[11]^: 45	Monmouthshire	Bronze Age	MM017 ^[12]
	Crick Round Barrow	Round barrow	Caerwent	51°36′32″N 2°44′45″W / 51.6088°N 2.7459°W / 51.6088; -2.7459 (Crick Round Barrow), ST484902	A round barrow (41m in diameter and 1.5m high). Excavations in 1939 and 1979 found Bronze Age flint tools, funerary remains, and a stone kerb ring 29m in diameter. Some of the cup stones may have been used for astronomical observations.^[13]	Monmouthshire	Bronze Age	MM151 ^[14]
	Foresters' Oaks round barrow	Round barrow	Caerwent	51°38′34″N 2°49′31″W / 51.6428°N 2.8254°W / 51.6428; -2.8254 (Foresters' Oaks round barrow), ST429941	A Bronze Age barrow approximately 16m in diameter and 1m high.	Monmouthshire	Bronze Age?	MM333 ^[15]
	Five Lanes Round Barrow	Round barrow	Caerwent	51°36′52″N 2°47′41″W / 51.6144°N 2.7946°W / 51.6144; -2.7946 (Five Lanes Round Barrow), ST450909	One of a pair of Bronze Age barrows (the other is not scheduled). The barrow is 35m in diameter but was probably smaller (25m).	Monmouthshire	Bronze Age	MM179 ^[16]
	Cwm Bwchel Round Cairn	Round cairn	Llanvihangel Crucorney	51°56′20″N 3°03′17″W / 51.9388°N 3.0548°W / 51.9388; -3.0548 (Cwm Bwchel Round Cairn), SO275272		Monmouthshire	Prehistoric	MM343 ^[17]
	Garreg Las Round Cairns	Round cairn	Llanvihangel Crucorney	51°55′30″N 3°00′23″W / 51.9249°N 3.0063°W / 51.9249; -3.0063 (Garreg Las Round Cairns), SO309256		Monmouthshire	Prehistoric	MM302 ^[18]
	Graig Ddu Round Cairn	Round cairn	Llanvihangel Crucorney	51°56′19″N 3°03′17″W / 51.9387°N 3.0548°W / 51.9387; -3.0548 (Graig Ddu Round Cairn), SO284264		Monmouthshire	Prehistoric	MM342 ^[19]
	Hatterrall Hill Enclosure	Enclosure	Llanvihangel Crucorney	51°55′27″N 3°00′30″W / 51.9241°N 3.0083°W / 51.9241; -3.0083 (Hatterrall Hill Enclosure), SO308255		Monmouthshire	Prehistoric	MM261 ^[20]
	Loxidge Tump cairn	Round cairn	Llanvihangel Crucorney	51°57′25″N 3°02′11″W / 51.9569°N 3.0363°W / 51.9569; -3.0363 (Loxidge Tump cairn), SO288292		Monmouthshire	Prehistoric	MM304 ^[21]
	Rhiw Arw cairn	Round cairn	Llanvihangel Crucorney	51°56′18″N 3°00′32″W / 51.9383°N 3.0089°W / 51.9383; -3.0089 (Rhiw Arw cairn), SO307271		Monmouthshire	Prehistoric	MM299 ^[22]
	Three Wells Round Cairn	Round cairn	Llanvihangel Crucorney	51°54′29″N 2°59′47″W / 51.908°N 2.9964°W / 51.908; -2.9964 (Three Wells Round Cairn), SH315237		Monmouthshire	Prehistoric	MM303 ^[23]
	Chepstow Park Wood Cairn	Round cairn	Devauden	51°40′28″N 2°44′15″W / 51.6744°N 2.7376°W / 51.6744; -2.7376 (Chepstow Park Wood Cairn), ST490975		Monmouthshire	Prehistoric	MM286 ^[24]
	Carn Blorenge	Round cairn	Llanfoist Fawr	51°48′02″N 3°03′37″W / 51.8006°N 3.0602°W / 51.8006; -3.0602 (Carn Blorenge), SO269118		Monmouthshire	Bronze Age	MM219 ^[25]
	Carn-y-Defaid Round Cairns	Round cairn	Llanfoist Fawr, (also Blaenavon), (see also Torfaen)	51°47′03″N 3°03′31″W / 51.7842°N 3.0585°W / 51.7842; -3.0585 (Carn-y-Defaid Round Cairns), SO270100		Monmouthshire	Prehistoric	MM209 ^[26]
	Middle Hendre Round Barrow	Round barrow	Llangattock-Vibon-Avel	51°49′12″N 2°47′37″W / 51.82°N 2.7936°W / 51.82; -2.7936 (Middle Hendre Round Barrow), SO453137		Monmouthshire	Prehistoric	MM112 ^[27]
	Round Barrow 180m North of Ty-Canol	Round barrow	Llanover	51°46′01″N 2°56′30″W / 51.767°N 2.9417°W / 51.767; -2.9417 (Round Barrow 180m North of Ty-Canol), SO351080		Monmouthshire	Prehistoric	MM081 ^[28]
	Wentwood Lodge Round Barrows	Round barrow	Shirenewton	51°38′48″N 2°50′41″W / 51.6467°N 2.8446°W / 51.6467; -2.8446 (Wentwood Lodge Round Barrows), ST416945	Two round barrows 180m north-west of Wentwood Lodge.	Monmouthshire	Prehistoric	MM167 ^[29]
	Lower Hale Wood Round Barrows	Round cairn	Tintern	51°42′20″N 2°41′42″W / 51.7055°N 2.6951°W / 51.7055; -2.6951 (Lower Hale Wood Round Barrows), SO520009	Three Round Barrows in Lower Hale Wood.	Monmouthshire	Prehistoric	MM191 ^[30]
	Gwehelog Camp	Enclosure	Gwehelog Fawr	51°43′04″N 2°52′27″W / 51.7177°N 2.8743°W / 51.7177; -2.8743 (Gwehelog Camp), SO397024	Also known as Gwernydd camp. 650m South of Ty Freeman.	Monmouthshire	Prehistoric	MM178 ^[31]
	Defended Enclosure 350m NNW of Ty-Uchaf	Enclosure - Defensive	Llanelly	51°49′51″N 3°07′34″W / 51.8309°N 3.1262°W / 51.8309; -3.1262 (Defended Enclosure 350m NNW of Ty-Uchaf), SO224153		Brecknockshire	Prehistoric	BR405 ^[32]
	Buckholt Wood Hilltop Enclosure	Enclosure	Monmouth	51°50′23″N 2°43′27″W / 51.8397°N 2.7241°W / 51.8397; -2.7241 (Buckholt Wood Hilltop Enclosure), SO502159		Monmouthshire	Prehistoric	MM258 ^[33]
	Sudbrook Camp and Sudbrook Chapel	Enclosure	Portskewett	51°34′57″N 2°42′55″W / 51.5826°N 2.7154°W / 51.5826; -2.7154 (Sudbrook Camp and Sudbrook Chapel), ST505873		Monmouthshire	Prehistoric	MM048 ^[34]
	Bishop Barnet's Wood Camp	Enclosure	Mathern	51°38′40″N 2°41′45″W / 51.6445°N 2.6957°W / 51.6445; -2.6957 (Bishop Barnet's Wood Camp), ST519941		Monmouthshire	Prehistoric	MM139 ^[35]
	Llanmelin Wood Hill Fort	Hill fort	Shirenewton	51°37′45″N 2°46′46″W / 51.6291°N 2.7794°W / 51.6291; -2.7794 (Llanmelin Wood Camps), ST461925	A roughly oval hilltop fort (140m by 100m), with an area of about 6.56 hectares.^[36] Originally univallate, but expansion in the 2nd century BC added further banks. Archaeological investigations have indicated occupation during Roman times and in the 12th and 13th centuries.	Monmouthshire	Iron Age	MM024 ^[37]
	The Larches Camp	Hill fort	Caerwent	51°36′21″N 2°49′13″W / 51.6058°N 2.8202°W / 51.6058; -2.8202 (The Larches Camp), ST432899	A roughly D-shaped hill top fort (140m by 100m), with an area of about 1.24 hectares.^[36] The north is protected by a steep slope, with a bank and ditch around the rest of the site.	Monmouthshire	Iron Age	MM069 ^[38]
	Chepstow Bulwarks Camp	Hill fort	Chepstow	51°37′52″N 2°40′08″W / 51.6312°N 2.6689°W / 51.6312; -2.6689 (Bulwarks Camp), ST538927	A small defensive hill fort, on top of cliffs overlooking the River Wye, the Beachley peninsula and the Severn estuary. It was probably built around the first century BC or the first century AD.	Monmouthshire	Iron Age	MM093 ^[39]
	Pen-Twyn Earthwork	Hill fort	Llanvihangel Crucorney	51°54′04″N 2°59′15″W / 51.9011°N 2.9874°W / 51.9011; -2.9874 (Pen-Twyn Earthwork), SO321229	A roughly rectangular hill top fort (140m by 70m), with an area of about 4.17 hectares.^[36] The fort is at the south end of Hatterall Hill with the ground sloping away to the east, south and west. The site is divided by a West-East bank and ditch. This may indicate the northern part is the oldest and extended later to include the southern part. Offa's Dyke Path passes through the site.	Monmouthshire	Iron Age	MM064 ^[40]
	Twyn-y-Gaer Camp	Hill fort	Llanvihangel Crucorney	51°53′30″N 3°01′38″W / 51.8916°N 3.0273°W / 51.8916; -3.0273 (Twyn-y-Gaer Camp), SO294219	An elongated oval summit hill fort (roughly 225m by 85m), with an area of about 2.97 hectares.^[36] The fort occupies the top of Gaer hill and is split into three enclosures. Excavations in the 1960s and 1970s discovered jewelry, tools, ovens, signs of metal working, and traces of timber housing.	Monmouthshire	Iron Age	MM148 ^[41]
	Llancayo Camp	Hill fort	Gwehelog Fawr	51°43′46″N 2°54′07″W / 51.7294°N 2.902°W / 51.7294; -2.902 (Llancayo Camp), SO378038	An oval univallate hill fort, of roughly 2.00 hectares^[36] at the northern edge of a ridge. The fort includes a complex entrance, possibly a causeway, at the south-east of the site.	Monmouthshire	Iron Age	MM078 ^[42]
	Coed y Bwnydd Camp	Hill fort	Llanarth	51°45′23″N 2°55′13″W / 51.7565°N 2.9203°W / 51.7565; -2.9203 (Coed y Bwnydd Camp), SO365068	A large multivallate fort at the southern tip of Clytha Hill. The oval fort measures about 170m by 114m with an area of 6.39 hectares.^[36]	Monmouthshire	Iron Age	MM075 ^[43]
	Gaer Fawr hill fort	Hill fort	Llangwm	51°41′07″N 2°48′35″W / 51.6853°N 2.8096°W / 51.6853; -2.8096 (Gaer Fawr hillfort), ST441988	A roughly oval multivallate hill fort on a spur with an area of 3.50 hectares.^[36] The hill fort is surrounded by steep slopes to the west, north, and east. The site is broken up by lanes and field boundaries.	Monmouthshire	Iron Age	MM062 ^[44]
	Great House Camp	Hill fort	Llangwm	51°43′34″N 2°49′23″W / 51.7261°N 2.8231°W / 51.7261; -2.8231 (Great House Camp), SO432033	A roughly circular multivallate hill fort sited on a natural terrace. The internal dimensions are 140m by 150m with an area of 2.37 hectares.^[36]	Monmouthshire	Iron Age?	MM105 ^[45]
	Cae Camp	Hill fort	Llanhennock	51°38′23″N 2°55′40″W / 51.6398°N 2.9278°W / 51.6398; -2.9278 (Cae Camp), ST358938	An oval bivallate fort situated on a ridge, roughly 92m by 86m with an area of 1.59 hectares.^[36] The sites contains a disused quarry from much later times.	Monmouthshire	Iron Age	MM079 ^[46]
	Candwr Camp	Hill fort	Llanhennock	51°38′09″N 2°58′11″W / 51.6357°N 2.9698°W / 51.6357; -2.9698 (Candwr Camp), ST329934	Also known as Caerau Hill fort. The univallate fort is roughly circular (100m by 75m), sited on a natural prominence, with an area of 0.70 hectares.^[36]	Monmouthshire	Iron Age	MM135 ^[47]
	Wilcrick Hill Camp	Hill fort	Magor with Undy, (also Bishton), (see also Newport)	51°35′09″N 2°51′04″W / 51.5859°N 2.8512°W / 51.5859; -2.8512 (Wilcrick Hill Camp), ST411877	A large, roughly oval (194m by 134m) multivallate hill fort with an area of 1.0 hectares.^[36] The fort is surrounded on all sides by steep slopes.	Monmouthshire	Iron Age	MM127 ^[48]
	Gaer Hill Camp, Penterry	Hill fort	St Arvans	51°40′40″N 2°42′01″W / 51.6779°N 2.7002°W / 51.6779; -2.7002 (Gaer Hill Camp, Penterry), ST516979	A hilltop fort with commanding views. The fort includes roughly rectangular inner area (46m x 68m), inside a larger, roughly circular enclosure (240m x 254m).	Monmouthshire	Iron Age	MM025 ^[49]
	Pierce Wood Camps	Hill fort	St Arvans	51°39′37″N 2°40′20″W / 51.6604°N 2.6721°W / 51.6604; -2.6721 (Pierce Wood Camps), ST536959	Two hill forts on a steeply sided promontory of the River Wye, to the east of Piercefield House. The smaller (westerly) univallate fort is roughly rectangular (98m x 82m), with an area of 0.20 hectares.^[36] The Wye Valley Walk passes through the site. The larger (easterly) univallate fort is also roughly rectangular (388m x 110m).	Monmouthshire	Iron Age	MM020 ^[50]
	Blackcliff Wood Camp	Hill fort	Tintern	51°41′16″N 2°40′58″W / 51.6878°N 2.6827°W / 51.6878; -2.6827 (Blackcliff Wood Camp), ST529990	A roughly oval fort (72m x 46m) with an area of 0.46 hectares.^[36] The Wye Valley Walk passes through the site. Also known as Porthcaseg Fort.	Monmouthshire	Iron Age	MM027 ^[51]
	Gaer hill fort, Trellech	Hill fort	Trellech United	51°43′49″N 2°44′08″W / 51.7303°N 2.7356°W / 51.7303; -2.7356 (Gaer hillfort, Trellech Cross), SO492037	A roughly circular (diameter 33m) bivallate fort with an area of 3.50 hectares.^[36]	Monmouthshire	Iron Age	MM077 ^[52]
	Abergavenny Roman Fort	Fort	Abergavenny	51°49′13″N 3°01′08″W / 51.8204°N 3.019°W / 51.8204; -3.019 (Abergavenny Roman Fort), SO298140		Monmouthshire	Roman	MM193 ^[53]
	Caerwent Roman Town (Venta Silurum)	House (domestic)	Caerwent	51°36′45″N 2°46′06″W / 51.6126°N 2.7683°W / 51.6126; -2.7683 (Caerwent Roman City), ST469907	Extensively excavated Roman town. Much of the excavated remains are now open to the public.	Monmouthshire	Roman	MM001 ^[54]
	Church Farm Romano-British settlement	Enclosure	Caldicot	51°35′57″N 2°44′59″W / 51.5993°N 2.7496°W / 51.5993; -2.7496 (Church Farm Romano-British settlement), ST481892		Monmouthshire	Late Iron Age/Roman	MM334 ^[55]
	Stoop Hill Cropmark Enclosure	Enclosure	Caldicot	51°34′58″N 2°44′50″W / 51.5828°N 2.7472°W / 51.5828; -2.7472 (Stoop Hill Cropmark Enclosure), ST483873	Enclosure revealed by Aerial Photography.	Monmouthshire	Roman	MM169 ^[56]
	Portskewett Hill Roman Site	Unclassified site	Portskewett	51°35′41″N 2°43′35″W / 51.5946°N 2.7264°W / 51.5946; -2.7264 (Portskewett Hill Roman Site), ST497886		Monmouthshire	Roman	MM019 ^[57]
	Usk Roman Site	Fort	Usk	51°42′05″N 2°53′58″W / 51.7014°N 2.8995°W / 51.7014; -2.8995 (Usk Roman Site), SO379006	The Roman legionary fortress of Burrium was founded on the site of Usk by the military commander Aulus Didius Gallus, around AD 55	Monmouthshire	Roman	MM155 ^[58]
	Five Lanes Roman Site	Villa	Caerwent	51°36′55″N 2°48′04″W / 51.6153°N 2.8011°W / 51.6153; -2.8011 (Five Lanes Roman Site), ST446910	Remains of a Roman villa comprising a winged corridor with five rooms and other structures. Near to the Roman town at Caerwent.	Monmouthshire	Roman	MM350 ^[59]
	Whitewall Brake Roman Site	Villa	Caerwent	51°37′00″N 2°45′33″W / 51.6168°N 2.7592°W / 51.6168; -2.7592 (Whitewall Brake Roman Site), ST475911	Rectilinear complex of building ranges and courts, where a Roman mosaic, along with characteristic Roman building debris was discovered	Monmouthshire	Roman	MM152 ^[60]
	Little Hadnock Roman Villa, Dixton Newtown	Villa	Monmouth	51°50′02″N 2°40′33″W / 51.8338°N 2.6758°W / 51.8338; -2.6758 (Little Hadnock Roman Villa, Dixton Newtown), SO535152	Group of stone buildings, one with hypocaust. Finds indicate occupation in the 2nd-3rd century AD.	Monmouthshire	Roman	MM195 ^[61]
	Wyndcliff Roman Site	Villa	St Arvans	51°40′30″N 2°41′04″W / 51.6751°N 2.6844°W / 51.6751; -2.6844 (Wyndcliff Roman Site), ST527975		Monmouthshire	Roman	MM351 ^[62]
	Hatterrall Hill Cross Ridge Dyke	Linear earthwork	Llanvihangel Crucorney	51°55′13″N 3°00′52″W / 51.9202°N 3.0144°W / 51.9202; -3.0144 (Hatterrall Hill Cross Ridge Dyke), SO303251		Monmouthshire	Early Medieval	MM260 ^[63]
	Skirrid Fawr hill fort	Hill fort	Llantilio Pertholey	51°51′28″N 2°58′23″W / 51.8579°N 2.9731°W / 51.8579; -2.9731 (Skirrid Fawr hillfort), SO330181	An elongated roughly oval multivallate hill fort at the northern end of a mountain ridge. The area of the hill fort includes the foundations of St Michael's Chapel.	Monmouthshire	Iron Age	MM182 ^[64]
	St Michaels Chapel (remains)	Chapel	Llantilio Pertholey	51°51′28″N 2°58′23″W / 51.8579°N 2.9731°W / 51.8579; -2.9731 (St Michael's Chapel (remains)), SO330181	The foundations of a medieval chapel (4m north-south by 7.5m east-west) at the northern end of a mountain ridge. The chapel lies within the area of the Skirrid Fawr hill fort.	Monmouthshire	Early Medieval	MM182 ^[64]
	Croes Lwyd Farm Cross	Cross	Raglan	51°45′30″N 2°52′12″W / 51.7584°N 2.8699°W / 51.7584; -2.8699 (Croes Lwyd Farm Cross), SO400069	An octagonal cross shaft and head carved from a single block. Marked on a 14th-century map.	Monmouthshire	Early Medieval	MM156 ^[65]
	St Arvan's Church Cross-slab	Cross-marked stone	St Arvans	51°39′55″N 2°42′01″W / 51.6653°N 2.7004°W / 51.6653; -2.7004 (St Arvan's Church Cross-slab), ST516965		Monmouthshire	Early Medieval	MM355 ^[66]
	Abergavenny Bridge	Bridge	Abergavenny	51°49′10″N 3°01′45″W / 51.8195°N 3.0292°W / 51.8195; -3.0292 (Abergavenny Bridge), SO291139	(also known as Tudor Bridge)	Monmouthshire	15th & 19th Century	MM010 ^[67]
	Abergavenny Castle	Castle	Abergavenny	51°49′11″N 3°01′03″W / 51.8197°N 3.0174°W / 51.8197; -3.0174 (Abergavenny Castle), SO299139	Fortified site since prehistoric times. 11th century Norman motte, with major building during 13th and 14th centuries. The keep was rebuilt in the 19th century and now houses a museum.	Monmouthshire	Medieval	MM056 ^[68]
	St Mary's Priory	Priory	Abergavenny	51°49′17″N 3°00′57″W / 51.8213°N 3.0157°W / 51.8213; -3.0157 (St Mary's Priory), SO300141	Area of Conventual Buildings.	Monmouthshire	Medieval	MM183 ^[69]
	Crick Medieval House	House (domestic)	Caerwent	51°36′32″N 2°44′15″W / 51.6089°N 2.7376°W / 51.6089; -2.7376 (Crick Medieval House), ST490902		Monmouthshire	Medieval	MM053 ^[70]
	Crick Moated Site	Moated Site	Caerwent	51°36′34″N 2°44′16″W / 51.6095°N 2.7378°W / 51.6095; -2.7378 (Crick Moated Site), ST490903		Monmouthshire	Medieval	MM051 ^[71]
	Dinham Castle	Castle	Caerwent	51°37′39″N 2°45′08″W / 51.6274°N 2.7522°W / 51.6274; -2.7522 (Dinham Castle), ST480923	Slight and overgrown remains of a small castle.^[72]^: 66 One of six castles around Wentwood Forest.^[b]	Monmouthshire	Medieval	MM153 ^[74]
	Llanvair Castle	Castle	Caerwent	51°37′40″N 2°48′07″W / 51.6278°N 2.802°W / 51.6278; -2.802 (Llanvair Castle), ST445924	Remains of a small courtyard castle.^[72]^: 29 One of six castles around Wentwood Forest.^[b]	Monmouthshire	Medieval	MM047 ^[75]
	St. Brides Netherwent Deserted Village	Deserted Medieval Village	Caerwent	51°36′06″N 2°49′39″W / 51.6017°N 2.8276°W / 51.6017; -2.8276 (St Brides Netherwent Deserted Village), ST427895	By tradition founded by Brochwael, the son of Meurig of Gwent, in the 10th century	Monmouthshire	Medieval	MM154 ^[76]
	Caldicot Castle (unoccupied parts)	Castle	Caldicot	51°35′36″N 2°44′36″W / 51.5932°N 2.7432°W / 51.5932; -2.7432 (Caldicot Castle (unoccupied parts)), ST486885	An extensive stone medieval castle (probably built on the site of an older earthwork castle) dated from the 13th and 14th century with some changes in the 15th century, and substantially restored and rebuilt in the 19th century.^[72]^: 15–18	Monmouthshire	Medieval	MM050 ^[77]
	The Berries Mound & Bailey Castle	Motte & Bailey	Caldicot	51°36′08″N 2°44′29″W / 51.6022°N 2.7415°W / 51.6022; -2.7415 (The Berries Mound & Bailey Castle), ST487895	Also known as Ballan Moor and Mount Ballan. A small motte with a large D-shaped bailey, in a low-lying, marshy area.^[78]^: 255 Probably built by the Ballon family in the late 11th century or early 12th century.^[72]^: 55	Monmouthshire	Medieval	MM026 ^[79]
	Chepstow Castle	Castle	Chepstow	51°38′37″N 2°40′32″W / 51.6437°N 2.6755°W / 51.6437; -2.6755 (Chepstow Castle), ST533940	The castle is the most southerly of the Welsh Marches castles, overlooking the River Wye. Constructed in the late 11th century with 12th- and 13th-century additions.	Monmouthshire	Medieval	MM003 ^[80]
	Chepstow Port Wall	Town defences	Chepstow	51°38′25″N 2°40′34″W / 51.6404°N 2.6762°W / 51.6404; -2.6762 (Chepstow Town Wall and Gate), ST533937		Monmouthshire	Medieval	MM002 ^[81]
	St Martin's Cwmyoy, Churchyard Cross	Cross	Llanvihangel Crucorney	51°54′15″N 3°01′13″W / 51.9042°N 3.0202°W / 51.9042; -3.0202 (Cwmyoy Churchyard Cross), SO299233		Monmouthshire	Medieval	MM142 ^[82]
	Llanthony Priory	Priory	Llanvihangel Crucorney	51°56′41″N 3°02′11″W / 51.9448°N 3.0364°W / 51.9448; -3.0364 (Llanthony Priory), SO289278		Monmouthshire	Medieval	MM004 ^[83]
	Pen-y-Clawdd Castle Mound	Motte	Llanvihangel Crucorney	51°52′31″N 3°00′13″W / 51.8752°N 3.0037°W / 51.8752; -3.0037 (Pen-y-Clawdd Castle Mound), SO310201	A low circular ditched mound.	Monmouthshire	Medieval	MM145 ^[84]
	Penbidwal Moated Site	Moated Site	Llanvihangel Crucorney	51°53′39″N 2°57′30″W / 51.8942°N 2.9582°W / 51.8942; -2.9582 (Penbidwal Moated Site), SO341221		Monmouthshire	Medieval	MM210 ^[85]
	Tre Fedw, Moat Mound and Bailey Castle	Motte & Bailey	Llanvihangel Crucorney	51°53′26″N 2°58′27″W / 51.8905°N 2.9743°W / 51.8905; -2.9743 (Tre Fedw, Moat Mound and Bailey Castle), SO330217		Monmouthshire	Medieval	MM063 ^[86]
	Chepstow Park Wood Moated Site	Moated Site	Devauden	51°40′42″N 2°44′20″W / 51.6783°N 2.7388°W / 51.6783; -2.7388 (Chepstow Park Wood Moated Site), ST490979		Monmouthshire	Medieval	MM103 ^[87]
	Cwrt y Gaer Ringwork	Ringwork	Devauden	51°41′42″N 2°47′56″W / 51.6949°N 2.799°W / 51.6949; -2.799 (Cwrt y Gaer Ringwork), ST448998		Monmouthshire	Medieval	MM067 ^[88]
	Holy Cross Kilgwrrwg, Churchyard Cross	Cross	Devauden	51°40′56″N 2°46′45″W / 51.6822°N 2.7792°W / 51.6822; -2.7792 (Kilgwrrwg Churchyard Cross), ST462984		Monmouthshire	Medieval	MM104 ^[89]
	St Thomas a Becket's Wolvesnewton, Churchyard Cross	Cross	Devauden	51°41′38″N 2°47′27″W / 51.6939°N 2.7909°W / 51.6939; -2.7909 (St. Thomas a Becket's Churchyard Cross, Wolvesnewton), ST454997		Monmouthshire	Medieval	MM330 ^[90]
	Goytre Wood Castle Mound	Motte	Grosmont	51°54′16″N 2°56′29″W / 51.9045°N 2.9415°W / 51.9045; -2.9415 (Goytre Wood Castle Mound), SO353233	Also known as Gwern Castle. A small damaged motte, 20m in diameter and 4m high. Remnants of a rectangular stone building on summit.^[78]^: 200	Monmouthshire	Medieval	MM138 ^[91]
	Grosmont Castle	Castle	Grosmont	51°54′55″N 2°51′57″W / 51.9154°N 2.8657°W / 51.9154; -2.8657 (Grosmont Castle), SO405244	The present ruins date from three building phases in the 11th and 12th centuries. One of 'The Three Castles'^[c] in the Monnow valley.	Monmouthshire	Medieval	MM007 ^[92]
	St Nicholas' Grosmont, Churchyard Cross	Cross	Grosmont	51°54′51″N 2°52′01″W / 51.9143°N 2.8669°W / 51.9143; -2.8669 (Grosmont Churchyard Cross), SO404243		Monmouthshire	Medieval	MM147 ^[93]
	St Cadoc's Llangattock Lingoed, Churchyard Cross	Cross	Grosmont	51°52′31″N 2°55′43″W / 51.8754°N 2.9287°W / 51.8754; -2.9287 (St. Cadoc's Churchyard Cross, Llangattock Lingoed), SO361200		Monmouthshire	Medieval	MM319 ^[94]
	St James's Llanvetherine, Churchyard Cross	Cross	Grosmont	51°50′59″N 2°55′28″W / 51.8497°N 2.9244°W / 51.8497; -2.9244 (St. James's Churchyard Cross, Llanvetherine), SO364171		Monmouthshire	Medieval	MM317 ^[95]
	St David's Trostre, Churchyard Cross	Cross	Gwehelog Fawr	51°44′05″N 2°55′43″W / 51.7347°N 2.9285°W / 51.7347; -2.9285 (St. David's Churchyard Cross, Trostre), SO359044		Monmouthshire	Medieval	MM321 ^[96]
	St Aeddan's Bettws Newydd, Churchyard Cross	Cross	Llanarth	51°44′52″N 2°55′30″W / 51.7478°N 2.9251°W / 51.7478; -2.9251 (Bettws Newydd Churchyard Cross-Base), SO362058		Monmouthshire	Medieval	MM122 ^[97]
	St Teilo's Llanarth, Churchyard Cross	Cross	Llanarth	51°47′37″N 2°54′24″W / 51.7937°N 2.9066°W / 51.7937; -2.9066 (Llanarth Churchyard Cross-Base), SO375109		Monmouthshire	Medieval	MM116 ^[98]
	St Mabli's Llanvapley, Churchyard Cross	Cross	Llanarth	51°49′18″N 2°55′12″W / 51.8217°N 2.9201°W / 51.8217; -2.9201 (St. Mabli's Churchyard Cross, Llanvapley), SO366140		Monmouthshire	Medieval	MM318 ^[99]
	St Peter's Bryngwyn, Churchyard Cross	Cross	Llanarth	51°46′45″N 2°53′05″W / 51.7792°N 2.8847°W / 51.7792; -2.8847 (St. Peter's Churchyard Cross, Bryngwyn), SO390093		Monmouthshire	Medieval	MM323 ^[100]
	Twyn y Cregen Castle Mound	Motte	Llanarth	51°46′55″N 2°55′31″W / 51.782°N 2.9252°W / 51.782; -2.9252 (Twyn y Cregen Castle Mound), SO362096	A 5m high mound 20m in diameter, and no traces of a ditch.	Monmouthshire	Medieval	MM080 ^[101]
	Wern-y-Cwrt Castle Mound	Motte	Llanarth	51°46′29″N 2°52′47″W / 51.7746°N 2.8797°W / 51.7746; -2.8797 (Wern-y-Cwrt Castle Mound), SO394088	A steep-sided mound (26m in diameter and 4.5m high) with traces of a surrounding ditch.	Monmouthshire	Medieval	MM099 ^[102]
	Graig Foel medieval ringwork	Ringwork	Llanbadoc	51°42′17″N 2°54′49″W / 51.7046°N 2.9136°W / 51.7046; -2.9136 (Graig Foel medieval ringwork), SO369010		Monmouthshire	Medieval	MM335 ^[103]
	Battle Tump	Mound	Llanelly	51°50′03″N 3°05′39″W / 51.8341°N 3.0941°W / 51.8341; -3.0941 (Battle Tump), SO247156		Brecknockshire	Medieval	BR010 ^[104]
	St Peter's Llanwenarth, Churchyard Cross	Cross	Llanfoist Fawr	51°49′38″N 3°03′09″W / 51.8271°N 3.0524°W / 51.8271; -3.0524 (Llanwenarth Churchyard Cross-Base), SO275147		Monmouthshire	Medieval	MM118 ^[105]
	St Faith's Llanfoist, Churchyard Cross	Cross	Llanfoist Fawr	51°48′46″N 3°02′11″W / 51.8129°N 3.0365°W / 51.8129; -3.0365 (St Faith's Churchyard Cross, Llanfoist), SO288132		Monmouthshire	Medieval	MM306 ^[106]
	Skenfrith Deserted Medieval Settlement	Deserted Medieval Village	Llangattock-Vibon-Avel	51°52′43″N 2°47′39″W / 51.8785°N 2.7942°W / 51.8785; -2.7942 (Skenfrith Deserted Medieval Settlement,), SO454202		Monmouthshire	Medieval	MM215 ^[107]
	Newcastle Castle	Motte & Bailey	Llangattock-Vibon-Avel	51°51′05″N 2°48′14″W / 51.8513°N 2.8038°W / 51.8513; -2.8038 (Newcastle Castle), SO447172		Monmouthshire	Medieval	MM085 ^[108]
	Grace Dieu Abbey	Abbey	Llangattock-Vibon-Avel	51°48′51″N 2°47′51″W / 51.8142°N 2.7974°W / 51.8142; -2.7974 (Site of Grace Dieu Abbey), SO451131		Monmouthshire	Medieval	MM158 ^[109]
	Skenfrith Castle	Castle	Llangattock-Vibon-Avel	51°52′43″N 2°47′25″W / 51.8786°N 2.7904°W / 51.8786; -2.7904 (Skenfrith Castle), SO456203	One of three castles brought under a single lordship in 1138, the present ruins date from the 12th century.^[72] ^: 46–47 One of 'The Three Castles'^[c] in the Monnow valley.	Monmouthshire	Medieval	MM088 ^[110]
	Llangwm Mound & Bailey Castle	Motte	Llangwm	51°41′38″N 2°49′47″W / 51.694°N 2.8297°W / 51.694; -2.8297 (Llangwm Mound & Bailey Castle), ST427997	A low oval (14m-16m) motte.	Monmouthshire	Medieval	MM061 ^[111]
	Rockfield Farm motte	Ringwork	Llangwm	51°42′21″N 2°50′04″W / 51.7057°N 2.8345°W / 51.7057; -2.8345 (Rockfield Farm motte), SO424011	Ringwork north-east of New House.	Monmouthshire	Medieval	MM074 ^[112]
	Ffynnon Cybi (St Cybi's Well)	Well	Llangybi	51°39′55″N 2°54′21″W / 51.6652°N 2.9058°W / 51.6652; -2.9058 (Ffynnon Cybi (St Cybi's Well)), ST374966		Monmouthshire	Medieval	MM074 ^[113]
	Llangibby Castle (Castell Tregrug)	Castle	Llangybi	51°40′18″N 2°55′16″W / 51.6717°N 2.9211°W / 51.6717; -2.9211 (Llangibby Castle (Castell Tregrug)), ST364973	A roughly rectangular castle sited on the summit of a ridge. Probably built in the early 14th century. The castle is largely ruinous but parts of walls and towers remain. Replaced an earlier motte and bailey (Llangibby Castle Mound) 400m to the east.	Monmouthshire	Medieval	MM109 ^[114]
	Llangibby Castle Mound	Motte	Llangybi	51°40′17″N 2°54′47″W / 51.6714°N 2.913°W / 51.6714; -2.913 (Llangibby Castle Mound), ST369973	Also known as Bowling Green. A large low flat-topped circular mound. The site was heavily landscaped in the 18th century. Generally supposed to pre-date the nearby Llangibby Castle, but may post-date the castle.^[78]^: 237	Monmouthshire	Medieval	MM110 ^[115]
	Castell Arnallt (Castle Arnold)	Motte	Llanover	51°47′06″N 2°59′14″W / 51.7849°N 2.9873°W / 51.7849; -2.9873 (Castle Arnold), SO319100	A fortified court house, or llys, of Seisyll ap Dyfnwal, lord of Over Gwent (Gwent Uwchcoed), before it was destroyed after Seisyll and some of his household were killed in 1175. Minor earthwork remains.	Monmouthshire	Medieval	MM086 ^[116]
	St Cadoc's Llangattock Nigh Usk, Churchyard Cross	Cross	Llanover	51°46′54″N 2°58′20″W / 51.7816°N 2.9722°W / 51.7816; -2.9722 (Llangattock Nigh Usk Churchyard Cross), SO330096	Parish is also known as Llangattock Juxta Usk.	Monmouthshire	Medieval	MM123 ^[117]
	St David's Llanddewi Rhydderch, Churchyard Cross	Cross	Llanover	51°48′41″N 2°56′40″W / 51.8114°N 2.9444°W / 51.8114; -2.9444 (Llanthewy-Rhytherch Churchyard Cross-Base), SO349129		Monmouthshire	Medieval	MM117 ^[118]
	St Michael's Llanvihangel Nigh Usk, Churchyard Cross	Cross	Llanover	51°46′40″N 2°56′57″W / 51.7778°N 2.9491°W / 51.7778; -2.9491 (Llanvihangel Nigh Usk Churchyard Cross), SO346092	(also known as Llanfihangel Gobion)	Monmouthshire	Medieval	MM124 ^[119]
	St Mary's Yard Castle Mound	Motte	Llanover	51°45′26″N 2°56′36″W / 51.7573°N 2.9434°W / 51.7573; -2.9434 (St Mary's Yard Castle Mound), SO349069	A low D-shaped mound near the village of Llanfair Kilgeddin.	Monmouthshire	Medieval	MM082 ^[120]
	St Bartholomew's Llanover, Churchyard Cross	Cross	Llanover	51°46′45″N 2°59′24″W / 51.7791°N 2.9901°W / 51.7791; -2.9901 (St. Bartholomew's Churchyard Cross, Llanover), SO317094		Monmouthshire	Medieval	MM307 ^[121]
	St Bridget's Llansantffraed, Churchyard Cross	Cross	Llanover	51°47′06″N 2°55′59″W / 51.7849°N 2.9331°W / 51.7849; -2.9331 (St. Bridget's Churchyard Cross, Llansantffraed), SO357099		Monmouthshire	Medieval	MM312 ^[122]
	St Mary's Llanfair Cilgedyn, Churchyard Cross	Cross	Llanover	51°46′22″N 2°56′06″W / 51.7729°N 2.9351°W / 51.7729; -2.9351 (St. Mary's Churchyard Cross, Llanfair Cilgedyn), SO355086		Monmouthshire	Medieval	MM326 ^[123]
	Hen Gwrt Moated Site	Moated Site	Llantilio Crossenny	51°49′53″N 2°52′42″W / 51.8315°N 2.8782°W / 51.8315; -2.8782 (Hen Gwrt Moated Site), SO395151		Monmouthshire	Medieval	MM094 ^[124]
	Penrhos Mound & Bailey Castle	Motte & Bailey	Llantilio Crossenny	51°48′53″N 2°51′29″W / 51.8146°N 2.8581°W / 51.8146; -2.8581 (Penrhos Mound & Bailey Castle), SO409132	A ditched motte, about 30m in diameter and 6.0m high, standing towards the south of an irregular oval enclosure defined by a ditch. It is possibly the castle mentioned as being demolished c.1252.	Monmouthshire	Medieval	MM097 ^[125]
	White Castle	Castle	Llantilio Crossenny	51°50′46″N 2°54′08″W / 51.8461°N 2.9022°W / 51.8461; -2.9022 (White Castle), SO379167	Norman in origins, it was first known as Llantilio Castle, but called the White Castle (after its whitewashed walls) from the 13th century. One of 'The Three Castles'^[c] in the Monnow valley.	Monmouthshire	Medieval	MM006 ^[126]
	Coed-Cwnwr Moated Site	Moated Site	Llantrisant Fawr	51°41′26″N 2°51′04″W / 51.6905°N 2.8511°W / 51.6905; -2.8511 (Coed-Cwnwr Moated Site), ST412994	An earthwork comprising a ditch enclosing a roughly 30m square area	Monmouthshire	Medieval	MM060 ^[127]
	Moated Site North West of Bertholey House (White Hall)	Moated Site	Llantrisant Fawr	51°38′57″N 2°53′02″W / 51.6493°N 2.8839°W / 51.6493; -2.8839 (Moated Site North West of Bertholey House), ST389948		Monmouthshire	Medieval	MM040 ^[128]
	The Procurator's House	House (domestic)	Magor with Undy	51°34′44″N 2°49′53″W / 51.579°N 2.8314°W / 51.579; -2.8314 (Medieval Building adjoining Magor Churchyard), ST424870	Post Medieval building adjoining Magor Churchyard	Monmouthshire	Post Medieval	MM180 ^[129]
	Medieval Moated Site 400m N of Undy Church	Moated Site	Magor with Undy	51°34′56″N 2°48′36″W / 51.5823°N 2.81°W / 51.5823; -2.81 (Medieval Moated Site 400m N of Undy Church), ST439873	Courtfield is a domestic site comprising a central 'platform' measuring 60m (NE-SW) by 45m, embanked on the NE, surrounded by a ditch up to 1.2m deep and an outer bank 0.5m high; traces of bank and ditch projecting NW from the N corner are still visible.	Monmouthshire	Medieval	MM198 ^[130]
	Relict Seawall alongside Collister Pill Reen	Seawall	Magor with Undy	51°34′33″N 2°48′04″W / 51.5759°N 2.801°W / 51.5759; -2.801 (Relict Seawall alongside Collister Pill Reen), ST445866	1.3 km stretch of embankment on the western side of Collister Pill Reen: thought to be an early feature in the landscape of the Caldicot levels	Monmouthshire	Medieval	MM226 ^[131]
	St Mary's Magor, Churchyard Cross	Cross	Magor with Undy	51°34′45″N 2°49′50″W / 51.5793°N 2.8306°W / 51.5793; -2.8306 (St. Mary's Churchyard Crosses, Magor), ST425870		Monmouthshire	Medieval	MM314 ^[132]
	St Mary's Undy, Churchyard Cross	Cross	Magor with Undy	51°34′42″N 2°48′35″W / 51.5782°N 2.8096°W / 51.5782; -2.8096 (Undy Churchyard Cross), ST439869		Monmouthshire	Medieval	MM126 ^[133]
	Moated Site South of Moynes Court	Moated Site	Mathern	51°36′52″N 2°41′41″W / 51.6144°N 2.6948°W / 51.6144; -2.6948 (Moated Site South of Moynes Court), ST519908		Monmouthshire	Medieval	MM187 ^[134]
	Runston Chapel	Chapel	Mathern	51°37′13″N 2°43′45″W / 51.6204°N 2.7293°W / 51.6204; -2.7293 (Runston Medieval Village Site & Runston Chapel), ST496915	Runston Medieval Village Site & Runston Chapel	Monmouthshire	Medieval	MM095 ^[135]
	Dingestow Castle	Motte	Mitchel Troy	51°47′24″N 2°47′25″W / 51.79°N 2.7902°W / 51.79; -2.7902 (Dingestow Castle), SO455104	Two large roughly rectangular enclosures surrounded by ditches and the River Trothy. Constructed in 1184 but immediately raided. The shape and size are unusual for a motte and bailey in the region, and may have been the start of a masonry castle. Excavations in 1969 found no masonry remains. May have been abandoned, or built using wood pallisades, as the castle was noted in 1469. Possibly intended as a replacement for the nearby Mill Wood Castle Mound.^[72]^: 26	Monmouthshire	Medieval	MM113 ^[136]
	Mill Wood Castle Mound	Motte	Mitchel Troy	51°47′22″N 2°47′05″W / 51.7894°N 2.7846°W / 51.7894; -2.7846 (Mill Wood Castle Mound), SO459103	A ditched mound, roughly 32m in diameter and 5m high, with an enclosed bailey to the north. An early example of a motte and bailey.	Monmouthshire	Medieval	MM114 ^[137]
	St Michaels Mitchel Troy, Churchyard Cross	Cross	Mitchel Troy	51°47′23″N 2°44′15″W / 51.7898°N 2.7375°W / 51.7898; -2.7375 (Mitchel Troy Churchyard Cross), SO492103	14th-century churchyard cross, 3.3 metres (11 ft) high, square sectioned with alternate ball flower and shield decorations, on a stepped base.	Monmouthshire	Medieval	MM111 ^[138]
	Moated Site at Coed-y-Fedw	Moated Site	Mitchel Troy	51°46′30″N 2°48′16″W / 51.7751°N 2.8044°W / 51.7751; -2.8044 (Moated Site at Coed-y-Fedw), SO446088		Monmouthshire	Medieval	MM213 ^[139]
	St Catwg's Cwmcarfan, Churchyard Cross	Cross	Mitchel Troy	51°45′49″N 2°45′31″W / 51.7636°N 2.7587°W / 51.7636; -2.7587 (St. Catwg's Churchyard Cross, Cwmcarfan), SO477074		Monmouthshire	Medieval	MM328 ^[140]
	St Dingad's Dingestow, Churchyard Cross	Cross	Mitchel Troy	51°47′22″N 2°47′18″W / 51.7895°N 2.7884°W / 51.7895; -2.7884 (St. Dingad's Churchyard Cross, Dingestow), SO457103		Monmouthshire	Medieval	MM316 ^[141]
	St Mary's Tregaer, Churchyard Cross	Cross	Mitchel Troy	51°47′16″N 2°50′44″W / 51.7878°N 2.8455°W / 51.7878; -2.8455 (St. Mary's Churchyard Cross, Tregaer), SO417102		Monmouthshire	Medieval	MM320 ^[142]
	Clawdd Du	Town defences	Monmouth	51°48′23″N 2°43′19″W / 51.8064°N 2.7219°W / 51.8064; -2.7219 (Clawdd Du), SO503122	A mediaeval linear defensive earthwork or moat, constructed as protection for the faubourg of Overmonnow, on the opposite side of the River Monnow from the town and castle of Monmouth.	Monmouthshire	Medieval	MM036 ^[143]
	Dixton Mound	Motte	Monmouth	51°49′12″N 2°42′03″W / 51.82°N 2.7008°W / 51.82; -2.7008 (Dixton Mound), SO517137	A low earth mound (30m by 40m and 2m high) surrounded by a ditch. Excavations found pottery indicating occupation in Roman times and the 11th and 12th centuries. No evidence of a motte or bailey. Possibly a moated site.^[78]^: 186	Monmouthshire	Medieval	MM125 ^[144]
	Monmouth Castle	Castle	Monmouth	51°48′45″N 2°43′00″W / 51.8125°N 2.7167°W / 51.8125; -2.7167 (Monmouth Castle), SO506128	Built on the site of an early Norman border castle, the only parts now visible are parts of the Great Tower (11th - 12th century), Hall (13th century), and parts of walls.	Monmouthshire	Medieval	MM159 ^[145]
	Monnow Bridge	Bridge	Monmouth	51°48′32″N 2°43′12″W / 51.809°N 2.72°W / 51.809; -2.72 (Monnow Bridge), SO504125	Medieval bridge over the River Monnow	Monmouthshire	Medieval	MM008 ^[146]
	St Peter's Dixton, Churchyard Cross	Cross	Monmouth	51°49′07″N 2°41′55″W / 51.8186°N 2.6985°W / 51.8186; -2.6985 (St. Peter's Churchyard Cross, Dixton), SO519135		Monmouthshire	Medieval	MM308 ^[147]
	Harold's House (site of)	House (domestic)	Portskewett	51°35′21″N 2°43′31″W / 51.5891°N 2.7253°W / 51.5891; -2.7253 (Harold's House (site of)), ST498880	An excavation was carried out for the TV programme Time Team, broadcast on 30 March 2008. The excavation revealed that a Norman fortified tower house had existed on the site, probably contemporaneous with the nearby church, and reached by a creek off the Severn	Monmouthshire	Medieval	MM029 ^[148]
	St Mary's Portskewett, Churchyard Cross	Cross	Portskewett	51°35′24″N 2°43′28″W / 51.5899°N 2.7245°W / 51.5899; -2.7245 (St. Mary's Churchyard Cross, Portskewett), ST499881		Monmouthshire	Medieval	MM315 ^[149]
	Raglan Castle	Castle	Raglan	51°46′13″N 2°50′59″W / 51.7702°N 2.8498°W / 51.7702; -2.8498 (Raglan Castle), SO417085	An impressive late medieval (13th - 15th century) stone castle.	Monmouthshire	Medieval	MM005 ^[150]
	St Cadoc's Raglan, Churchyard Cross	Cross	Raglan	51°45′53″N 2°51′05″W / 51.7646°N 2.8514°W / 51.7646; -2.8514 (Raglan Churchyard Cross), SO414077		Monmouthshire	Medieval	MM100 ^[151]
	St Govan's Llangovan, Churchyard Cross	Cross	Raglan	51°44′43″N 2°47′18″W / 51.7453°N 2.7882°W / 51.7453; -2.7882 (St. Govan's Churchyard Cross, Llangovan), SO456054		Monmouthshire	Medieval	MM327 ^[152]
	St John's Llandenny, Churchyard Cross	Cross	Raglan	51°43′51″N 2°50′54″W / 51.7309°N 2.8482°W / 51.7309; -2.8482 (St. John's Churchyard Cross, Llandenny), SO415039		Monmouthshire	Medieval	MM322 ^[153]
	St Martin's Pen-y-Clawdd, Churchyard Cross	Cross	Raglan	51°46′00″N 2°47′39″W / 51.7667°N 2.7943°W / 51.7667; -2.7943 (St. Martin's Churchyard Cross, Pen-y-Clawdd), SO452078		Monmouthshire	Medieval	MM329 ^[154]
	Trecastle Motte and Bailey	Motte and Bailey	Raglan	51°45′34″N 2°47′45″W / 51.7594°N 2.7957°W / 51.7594; -2.7957 (Trecastle Motte and Bailey), SO451070	An oval motte with bailey to the south surrounded by a moat.	Monmouthshire	Medieval	MM098 ^[155]
	St Michael's Llanfihangel Rogiet, Churchyard Cross	Cross	Rogiet	51°35′13″N 2°47′36″W / 51.5869°N 2.7934°W / 51.5869; -2.7934 (St. Michael's Churchyard Cross, Llanfihangel Rogiet), ST451878		Monmouthshire	Medieval	MM325 ^[156]
	Cas Troggy Castle	Castle	Shirenewton	51°39′09″N 2°50′49″W / 51.6526°N 2.8469°W / 51.6526; -2.8469 (Cas Troggy Castle), ST415952	Small ruined fortified hunting lodge or manor house built by Roger Bigod around 1303. One of six castles around Wentwood Forest.^[b]	Monmouthshire	Medieval	MM015 ^[157]
	St Mary's Penterry, Churchyard Cross	Cross	Tintern	51°41′07″N 2°41′46″W / 51.6854°N 2.6962°W / 51.6854; -2.6962 (St. Mary's Churchyard Cross, Penterry), ST519987		Monmouthshire	Medieval	MM331 ^[158]
	Tintern Abbey Inner Precinct	Abbey	Tintern	51°41′49″N 2°40′36″W / 51.6969°N 2.6768°W / 51.6969; -2.6768 (Tintern Abbey, Inner Precinct), SO533000		Monmouthshire	Medieval	MM102 ^[159]
	Tintern Abbey, Precinct Wall	Wall	Tintern	51°41′50″N 2°40′49″W / 51.6971°N 2.6802°W / 51.6971; -2.6802 (Tintern Abbey, Precinct Wall), SO530000		Monmouthshire	Medieval	MM157 ^[160]
	Tintern Abbey, Watergate	Gatehouse	Tintern	51°41′53″N 2°40′41″W / 51.6981°N 2.678°W / 51.6981; -2.678 (Tintern Abbey, Watergate), SO532001		Monmouthshire	Medieval	MM265 ^[161]
	Medieval House Sites W of Trellech Church	Shrunken Medieval Village	Trellech United	51°44′46″N 2°43′34″W / 51.746°N 2.7261°W / 51.746; -2.7261 (Medieval House Sites W of Trellech Church), SO499055		Monmouthshire	Medieval	MM194 ^[162]
	St Mary's Penallt, Churchyard Cross	Cross	Trellech United	51°47′35″N 2°41′40″W / 51.7931°N 2.6944°W / 51.7931; -2.6944 (Penallt Churchyard Cross), SO522107		Monmouthshire	Medieval	MM146 ^[163]
	The Virtuous Well	Holy Well	Trellech United	51°44′33″N 2°43′16″W / 51.7424°N 2.7212°W / 51.7424; -2.7212 (The Virtuous Well), SO503051		Monmouthshire	Medieval	MM171 ^[164]
	St Nicholas' Trellech, Churchyard Cross	Cross	Trellech United	51°44′44″N 2°43′30″W / 51.7456°N 2.7249°W / 51.7456; -2.7249 (Trellech Churchyard Cross), SO500054	Five-stepped pedestal, large socketstone, with two sections of shaft and a modern cross-head, in St Nicholas' Churchyard, Trellech.	Monmouthshire	Medieval	MM107 ^[165]
	Trellech Cross Preaching Cross	Cross	Trellech United	51°43′59″N 2°43′35″W / 51.733°N 2.7263°W / 51.733; -2.7263 (Trellech Cross), SO499040	Wayside cross. Two stone steps on a roadside grassy bank.	Monmouthshire	Medieval	MM108 ^[166]
	Trellech Shrunken Medieval Village	Shrunken Medieval Village	Trellech United	51°44′32″N 2°43′23″W / 51.7422°N 2.723°W / 51.7422; -2.723 (Trellech Shrunken Medieval Village), SO501050	From 1250 to its decline around 1600, Trellech was a booming iron-melting centre. The scheduled area is close to the present village centre but an ongoing archaeological dig further south has found many building foundations.	Monmouthshire	Medieval	MM272 ^[167]
	Tump Terrett Castle Mound	Motte	Trellech United	51°44′41″N 2°43′33″W / 51.7447°N 2.7257°W / 51.7447; -2.7257 (Tump Terrett Castle Mound), SO499053	A steep-sided ditched mound (36m in diameter and 5.5m high). Mentioned in 1231 and later referred to as "site of" in 1306. Recent excavations and investigation suggest a Motte and Bailey castle, built early in the period of the Norman conquest of the area.^[78]^: 332	Monmouthshire	Medieval	MM016 ^[168]
	Usk Castle (Unoccupied parts)	Castle	Usk	51°42′19″N 2°54′12″W / 51.7052°N 2.9033°W / 51.7052; -2.9033 (Usk Castle (Unoccupied Parts)), SO376011	A substantial masonry castle dating from around 1138 and now generally ruinous.	Monmouthshire	Medieval	MM012 ^[169]
	Usk Priory Gatehouse	Gatehouse	Usk	51°42′09″N 2°54′03″W / 51.7024°N 2.9009°W / 51.7024; -2.9009 (Usk Priory Gatehouse), SO378007	A surviving fragment of a Benedictine priory founded around 1135 and dissolved in 1536	Monmouthshire	Medieval	MM090 ^[170]
	Chepstow Town Slipway	Quay	Chepstow	51°38′40″N 2°40′07″W / 51.6445°N 2.6686°W / 51.6445; -2.6686 (Chepstow Town Slipway), ST538941	A well preserved post-medieval slip compromising of a cambered cobbled slipway some 25m long by 2.6m wide, sloping at an angle of 10 degrees. The final 5.0m of the slipway forms a flight of shallow steps down to the low-tide mark in the River Wye	Monmouthshire	Post Medieval	MM301 ^[171]
	Hygga Farm Dovecote	Dovecote	Trellech United	51°43′45″N 2°44′46″W / 51.7292°N 2.7462°W / 51.7292; -2.7462 (Hygga Farm Dovecote), SO485036	A circular stone dovecote with mullion windows and a conical roof.	Monmouthshire	Post Medieval	MM150 ^[172]
	Disgwylfa Tramroads	Tramroad	Llanelly, (also Llangattock), (see also Powys)	51°49′08″N 3°08′14″W / 51.8189°N 3.1371°W / 51.8189; -3.1371 (Disgwylfa Tramroads), SO217139		Brecknockshire	Post Medieval	MM340 ^[173]
	Lower or Abbey Wireworks, Tintern	Iron forge	Tintern	51°41′52″N 2°41′11″W / 51.6977°N 2.6864°W / 51.6977; -2.6864 (Lower or Abbey Wireworks, Tintern), SO526001	Early industrial site, manufacturing wire from the 16th to the 19th centuries. It was part of an integrated iron production system, sited along the Angidy Valley. The manufacture of wire was the final stage in the process, closest to the River Wye, at the foot of the valley.	Monmouthshire	Post Medieval	MM266 ^[174]
	Tintern Upper Wireworks (New Tongs Mill)	Leat	Tintern	51°41′59″N 2°42′44″W / 51.6997°N 2.7123°W / 51.6997; -2.7123 (Tintern Upper Wireworks (New Tongs Mill)), SO508003		Monmouthshire	Post Medieval	MM268 ^[175]
	Whitebrook Wireworks Leat	Leat	Trellech United	51°45′24″N 2°41′00″W / 51.7567°N 2.6833°W / 51.7567; -2.6833 (Whitebrook Wireworks Leat), SO529066		Monmouthshire	Post Medieval	MM292 ^[176]
	Cewere Quarry and Limekiln, Llanvair-Discoed	Quarry	Caerwent	51°37′44″N 2°47′15″W / 51.629°N 2.7874°W / 51.629; -2.7874 (Cewere Quarry and Limekiln, Llanvair-Discoed), ST455925	A well-preserved limekiln and quarry with associated earthworks. The kiln is of a Wye Valley type, roughly 4m high and 6.5m long, built into the bank to the south of the quarry.	Monmouthshire	19th Century	MM289 ^[177]
	Limekiln and Quarries at Craig-yr-Hafod	Limekiln	Llanfoist Fawr	51°47′14″N 3°03′21″W / 51.7871°N 3.0558°W / 51.7871; -3.0558 (Limekiln and Quarries at Craig-yr-Hafod), SO272103		Monmouthshire	Post Medieval	MM278 ^[178]
	Pwll Du Limestone Quarry & Water Balance Lift	Industrial monument	Llanfoist Fawr	51°47′51″N 3°05′12″W / 51.7974°N 3.0866°W / 51.7974; -3.0866 (Pwll Du Limestone Quarry & Water Balance Lift), SO251115		Monmouthshire	Post Medieval	MM225 ^[179]
	Colwell Grove Limekiln and Quarry, Tintern	Limekiln	Tintern	51°41′40″N 2°40′36″W / 51.6945°N 2.6768°W / 51.6945; -2.6768 (Colwell Grove Limekiln and Quarry, Tintern), ST533997		Monmouthshire	Post Medieval	MM290 ^[180]
	Clearwater Paper Mill	Mill	Trellech United	51°45′27″N 2°40′49″W / 51.7575°N 2.6804°W / 51.7575; -2.6804 (Clearwater Paper Mill), SO531067		Monmouthshire	Post Medieval	MM294 ^[181]
	Whitebrook Wireworks	Iron forge	Trellech United	51°45′16″N 2°40′50″W / 51.7545°N 2.6805°W / 51.7545; -2.6805 (Whitework Wireworks), SO531064		Monmouthshire	Post Medieval	MM270 ^[182]
	Tramway Embankment of Grosmont Railway	Tramway embankment	Llanvihangel Crucorney	51°53′06″N 2°58′13″W / 51.885°N 2.9704°W / 51.885; -2.9704 (Tramway Embankment of Grosmont Railway), SO333211		Monmouthshire	Post Medieval	MM199 ^[183]
	Blorenge Quarries Tramroad	Tramroad	Llanfoist Fawr	51°48′02″N 3°04′13″W / 51.8006°N 3.0703°W / 51.8006; -3.0703 (Blorenge Quarries Tramroad), SO262118		Monmouthshire	Post Medieval	MM288 ^[184]
	Blorenge Tunnel, Hill's Tramroad	Tramroad	Llanfoist Fawr	51°48′35″N 3°03′30″W / 51.8098°N 3.0583°W / 51.8098; -3.0583 (Blorenge Tunnel, Hill's Tramroad), SO271128	Tunnel, length approximately 40m, carrying Hill's Tramroad. On the north slope of the Blorenge.	Monmouthshire	Post Medieval	MM275 ^[185]
	Hill's Tramroad Inclines, Llanfoist	Tramroad	Llanfoist Fawr	51°48′31″N 3°02′52″W / 51.8085°N 3.0478°W / 51.8085; -3.0478 (Hill's Tramroad Inclines, Llanfoist), SO278127		Monmouthshire	19th Century	MM276 ^[186]
	Pen-ffordd-goch Iron and coal patching, Blaenavon	Industrial monument	Llanfoist Fawr, (also Blaenavon), (see also Torfaen)	51°47′18″N 3°04′38″W / 51.7882°N 3.0773°W / 51.7882; -3.0773 (Pen-ffordd-goch Iron and coal patching, Blaenavon), SO257104	Pen-ffordd-goch is also known as The Keepers. The site is connected with the Hanbury estate from the 17th century and Blaenavon Ironworks from about 1788. The remains of scouring and adit mining include leats, ponds, dams, scours, levels, tips, shaft mounds, tracks and tramroads.	Monmouthshire	17th Century	MM227 ^[187]
	Carreg Maen Taro Ironstone Quarries	Quarry	Llanfoist Fawr, (also Blaenavon), (also Llanelly), (see also Torfaen)	51°47′38″N 3°06′20″W / 51.794°N 3.1056°W / 51.794; -3.1056 (Carreg Maen Taro Ironstone Quarries), SO238111		Monmouthshire	Post Medieval	MM295 ^[188]
	Pwll Du Tramroad Tunnel Northern Entrances & Site of Lower Bank	Industrial monument	Llanfoist Fawr	51°47′55″N 3°05′45″W / 51.7987°N 3.0957°W / 51.7987; -3.0957 (Pwll Du Tramroad Tunnel Northern Entrances & Site of Lower Rank), SO245116	Tunnel ran from near Blaenafon Iron works to link with the tramroad to the Brecon and Newport Canal at Llanfoist	Monmouthshire	19th Century	MM224 ^[189]
	Tramroad Bridge, Bailey's Tramroad, Govilon	Bridge	Llanfoist Fawr	51°48′50″N 3°04′31″W / 51.8138°N 3.0754°W / 51.8138; -3.0754 (Tramroad Bridge, Bailey's Tramroad, Govilon), SO259133	Also known as Cwm Llanwenarth bridge	Monmouthshire	19th Century	MM204 ^[190]
	Perth-hir House (Remains of)	House (domestic)	Llangattock-Vibon-Avel	51°50′23″N 2°44′47″W / 51.8396°N 2.7463°W / 51.8396; -2.7463 (Perth-Hir House (Remains of)), SO486159		Monmouthshire	Post Medieval	MM144 ^[191]
	Blackcliff Wood Limekiln	Limekiln	Tintern	51°40′49″N 2°40′37″W / 51.6803°N 2.6769°W / 51.6803; -2.6769 (Blackcliff Wood Limekiln), ST532981		Monmouthshire	Post Medieval	MM291 ^[192]
	Abbey Tintern Furnace	Industrial monument	Tintern	51°41′57″N 2°42′18″W / 51.6992°N 2.705°W / 51.6992; -2.705 (Abbey Tintern Furnace), SO513002	Angidy Ironworks. Also known as 'The Old Blast Furnace', it smelted Iron from the 1590s to the 1820s. It was a key part of the industrial metalworking of the Angidy Valley, producing iron for the wireworks further down the valley.	Monmouthshire	Post Medieval	MM197 ^[193]
	Coed-Ithel Iron Furnace	Kiln	Trellech United	51°43′12″N 2°41′05″W / 51.7199°N 2.6847°W / 51.7199; -2.6847 (Coed-Ithel Iron Furnace), SO527025	Early iron furnace.	Monmouthshire	Post Medieval	MM164 ^[194]
	Woolpitch Wood Iron Furnace	Kiln	Trellech United	51°44′25″N 2°44′21″W / 51.7402°N 2.7392°W / 51.7402; -2.7392 (Woolpitch Wood Iron Furnace), SO490048	Early iron furnace.	Monmouthshire	Post Medieval	MM177 ^[195]
	Clydach Ironworks (remains) and Smart's Bridge	Industrial monument	Llanelly	51°48′45″N 3°07′11″W / 51.8126°N 3.1196°W / 51.8126; -3.1196 (Clydach Ironworks (remains) and Smart's Bridge), SO229132		Brecknockshire	18th Century (Ironworks) and 19th Century (Bridge)	BR161 ^[196]
	Gilwern Embankment	Industrial monument	Llanelly	51°49′25″N 3°05′54″W / 51.8237°N 3.0982°W / 51.8237; -3.0982 (Gilwern Embankment), SO244144		Monmouthshire	18th Century	MM251 ^[197]
	Iron Furnace SW of Clydach	Industrial monument	Llanelly	51°49′04″N 3°06′53″W / 51.8179°N 3.1148°W / 51.8179; -3.1148 (Iron Furnace SW of Clydach), SO232138	Llanelly Furnace.	Brecknockshire	17th Century	BR160 ^[198]
	Garnddyrys Ironworks (Site of) and adjacent Tramway	Industrial monument	Llanfoist Fawr	51°48′00″N 3°04′39″W / 51.7999°N 3.0774°W / 51.7999; -3.0774 (Garnddyrys Ironworks (Site of) and adjacent Tramway), SO258118		Monmouthshire	Post Medieval	MM189 ^[199]
	The Graig Settlement	Settlement	Llanfoist Fawr	51°50′27″N 3°04′51″W / 51.8409°N 3.0808°W / 51.8409; -3.0808 (The Graig Settlement), SO256163		Monmouthshire	Post Medieval	MM273 ^[200]
	Redbrook Incline Bridge	Bridge	Monmouth	51°47′21″N 2°40′24″W / 51.7892°N 2.6733°W / 51.7892; -2.6733 (Redbrook Incline Overbridge), SO536102	Carried Redbrook tin plate tramway until closure in 1872	Monmouthshire	Post Medieval	MM203 ^[201]
	Royal Navy Propellant Factory, Caerwent, Nitro-glycerine Hill	Industrial building	Caerwent	51°37′22″N 2°44′55″W / 51.6228°N 2.7487°W / 51.6228; -2.7487 (Royal Naval Propellant Factory Caerwent Nitro-glycerine Hill), ST482918	An extensive site chosen for development for propellant manufacture due to natural slope and availability of water.	Monmouthshire	20th Century	MM352 ^[202]
	Royal Navy Propellant Factory, Caerwent Guided Weapons Scheme Static Firing Bay	Royal Naval Depot	Caerwent	51°37′31″N 2°45′20″W / 51.6253°N 2.7555°W / 51.6253; -2.7555 (Royal Naval Propellant Factory Guided Weapons Scheme Static Firing Bay), ST478921	Built in 1959 to research and test the rocket booster engines for the Royal Navy's Sea Slug surface-to-air missiles	Monmouthshire	20th Century	MM341 ^[203]
	Dyne Steel Incline	Incline	Llanfoist Fawr, (also Blaenavon), (see also Torfaen)	51°47′36″N 3°06′06″W / 51.7933°N 3.1017°W / 51.7933; -3.1017 (Dyne Steel Incline), SO241110		Monmouthshire	Post Medieval	MM280 ^[204]
	The Alcove, Piercefield	Folly	St Arvans	51°38′59″N 2°40′52″W / 51.6496°N 2.6811°W / 51.6496; -2.6811 (The Alcove, Piercefield), ST529947	Semi-octagonal platform with a semi-circular stone seat with views of the Wye Valley and cliffs below Chepstow castle. The first of the viewpoints constructed in around 1850, for the Piercefield walk. Originally roofed with an arch.^[205]	Monmouthshire	18th Century	MM285 ^[206]
	The Cold Bath, Piercefield	Bath-house	St Arvans	51°40′05″N 2°41′18″W / 51.6681°N 2.6884°W / 51.6681; -2.6884 (The Cold Bath: Piercefield), ST524968	Remains of a small rectangular brick and stone building which housed a tile-lined plunge pool.	Monmouthshire	18th Century	MM281 ^[207]
	The Giant's Cave, Piercefield	Cave	St Arvans	51°39′48″N 2°41′20″W / 51.6633°N 2.6888°W / 51.6633; -2.6888 (The Giant's Cave, Piercefield), ST524962	Curved tunnel cut into the rockface. One of the features of the Piercefield Walk.	Monmouthshire	18th Century	MM282 ^[208]
	The Grotto, Piercefield	Grotto	St Arvans	51°39′30″N 2°40′36″W / 51.6584°N 2.6766°W / 51.6584; -2.6766 (The Grotto, Piercefield), ST532957	A small domed alcove made of brick and built to provide a shaded seat with spectacular views across the Wye Valley, and originally lined with iron cinders, copper and quartz.^[205] One of the features on the Piercefield Walk.	Monmouthshire	18th Century	MM283 ^[209]
	The Platform, Piercefield	Folly	St Arvans	51°39′18″N 2°40′36″W / 51.655°N 2.6767°W / 51.655; -2.6767 (The Platform, Piercefield), ST532953		Monmouthshire	18th Century	MM284 ^[210]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 04, 2023