Atlas of Hillforts of Britain and Ireland

WA2435 Twyn y Gaer, Llanfihangel Crucorney, Monmouthshire

LiDAR 1m DTM Hillshade

LiDAR 1m DTM Hillshade

Satellite Imagery

Satellite Imagery

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HER:  Glamorgan Gwent 01713g (None)

NMR:  SO 22 SE (300043)

SM:  MM148

NGR:  SO29402195

X:  329400  Y:  221950  (OSGB36)

Summary

Commanding, excavated contour hillfort located high (426m O.D.) on the interfluve between the Wye catchment and Usk catchments, near the Honddu and Monnow confluence, above the S end of Vale of Ewyas. Surrounding slopes very steep to S, slightly less on N and W and moderate to strong on E, with internal area of 1.8ha. Oblong in shape with long axis aligned E-W. Two cross-bank and ditches running N-S divide the internal area of enclosure into three. Complicated phased construction. Initially, an enclosure with central cross bank and simple gap entrance as its E extremity. Then an E enclosure enclosed by bank and ditch and E entrance built. Finally, the W-most cross bank delineated a smaller fort at this W end. Main bank had a dry-stone revetment with later wall-walk overall, with an outer bank on W. Average width of ramparts and ditches is c. 9.0m. Average overall width of cross-banks and ditches c.12.0m. Banks have strong stone content. Inner banks deteriorated to a scarp across most of the S and SW sides. Simple gap entrance in middle cross bank, the W slightly inturned. E entrance had long passageway revetted in stone, with a gate at the inner end, with refinements and alterations over time. Interior slightly convex, with little surface sign of any features, although few shallow hollows in N area. Excavation (Probert 1976) showed hut platforms and many mostly domestic artefacts with ironworking. First phase of the early Iron Age, with C14 date of c. 400 BC for its end.

Status

Citizen Science:  ✗

Reliability of Data:  Confirmed

Reliability of Interpretation:  Confirmed

Location

X:  -337003  Y:  6780544  (EPSG: 3857)

Longitude:  -3.0273453920646447  Latitude:  51.89157274785586  (EPSG:4326)

Country:  Wales

Current County or Unitary Authority:  Monmouth

Historic County:  Monmouthshire

Current Parish/Community/Council/Townland:  Crucorney

Monument Condition

Ramparts not strong but fair preservation. Mostly overgrown piles of stones and once higher and ditches deeper.

Condition:
Extant   ✓
Cropmark   ✗
Likely Destroyed   ✗

Land Use

Moorland grazing and scrub.

Current Use:
Woodland   ✗
Commercial Forestry Plantation   ✗
Parkland   ✗
Pasture (Grazing)   ✗
Arable   ✗
Scrub/Bracken   ✓
Bare Outcrop   ✗
Heather/Moorland   ✓
Heath   ✗
Built-up   ✗
Coastal Grassland   ✗
Other   ✗

Landscape

Hillfort Type

Excavated contour hillfort located high (426m O.D.) on the interfluve between the Wye catchment and Usk catchments, near the Honddu and Monnow confluence, above theS end of Vale of Ewyas. IIn a commanding position. Surrounding slopes very steep to S, slightly less on N and W and moderate to strong on E.

Type:
Contour Fort   ✓
Partial Contour Fort   ✗
Promontory Fort   ✗
Hillslope Fort   ✗
Level Terrain Fort   ✗
Marsh Fort   ✗
Multiple Enclosure Fort   ✗

Topographic Position

Position:
Hilltop   ✓
Coastal Promontory   ✗
Inland Promontory   ✗
Valley Bottom   ✗
Knoll/Hillock/Outcrop   ✗
Ridge   ✗
Cliff/Plateau-edge/Scarp   ✗
Hillslope   ✗
Lowland   ✗
Spur   ✗

Dominant Topographic Feature:  Hill top

Aspect:
North   ✗
Northeast   ✗
East   ✗
Southeast   ✗
South   ✗
Southwest   ✗
West   ✗
Northwest   ✗
Level   ✓

Altitude:  426.0m

Boundary

N/A


Dating Evidence

First phase of the early Iron Age, with C14 date of c. 400 BC for its end.

Reliability:  B - Medium

Principal Activity:
Pre 1200BC   ✗
1200BC - 800BC   ✗
800BC - 400BC   ✓
400BC - AD50   ✗
AD50 - AD400   ✗
AD400 - AD 800   ✗
Post AD800   ✗
Unknown   ✗

Other Activity:
Pre Hillfort:   None
Post Hillfort:   None

Evidence:
C14:   C14 date of c. 400 BC for end.

Investigation History

Excavation by A. Probert 1965-1970's? GGAT Prehistoric defended enclosures in Glamorgan survey 2005.

Investigations:
Other (1982):   Visited by Hillfort Study Group
Other (2005):   GGAT survey.
Excavation (None):   A. Probert

Interior Features

Shallow hollows in N area - uncertain features. No visible surface trace of internal habitations. Excavation showed hut platforms and many mostly domestic finds with ironworking, including La Tene style brooches, querns (saddle and beehive) decorative beads, spindle whorls, flints, crucibles and clay ovens. Also a metal spearhead and a metal pin thought to be a carriage pin. Evidence of metal working. Two apparent size contractions identified from a private aerial photograph taken in 1999 (HER refers).

Water Source

Afon Grwynne 0.65km.

Source:
None   ✓
Spring   ✗
Stream   ✗
Pool   ✗
Flush   ✗
Well   ✗
Other   ✗

Surface

Shallow hollows in N area - uncertain features.

Interior Features (Surface):
No Known Features   ✗
Round Stone Structures   ✗
Rectangular Stone Structures   ✗
Curvilinear Platforms   ✗
Other Roundhouse Evidence   ✗
Pits   ✗
Quarry Hollows   ✗
Other   ✓

Excavation

Excavation showed hut platforms; possibly roundhouses?

Interior Features (Excavation):
No Known Excavation   ✗
Pits   ✗
Postholes   ✗
Roundhouses   ✓
Rectangular Structures   ✗
Roads/Tracks   ✗
Quarry Hollows   ✗
Other   ✓
Nothing Found   ✗

Geophysics

None

Interior Features (Geophysics):
No Known Geophysics   ✓
Pits   ✗
Roundhouses   ✗
Rectangular Structures   ✗
Roads/Tracks   ✗
Quarry Hollows   ✗
Other   ✗
Nothing Found   ✗

Finds

Domestic artefacts including La Tene style brooches, querns (saddle and beehive) decorative beads, spindle whorls, flints, crucibles and clay ovens. Also a metal spearhead and a metal pin thought to be a carriage pin. Evidence of metal working.

Interior (Finds):
No Known Finds   ✗
Pottery   ✗
Metal   ✗
Metalworking   ✓
Human Bones   ✗
Animal Bones   ✗
Lithics   ✓
Environmental   ✗
Other   ✓

Aerial

Two apparent size contractions identified from a private aerial photograph taken in 1999 (HER refers).

Interior Features (Aerial):
APs Not Checked   ✗
None   ✗
Roundhouses   ✗
Rectangular Structures   ✗
Pits   ✗
Postholes   ✗
Roads/Tracks   ✗
Other   ✓

Entrances

E bank has a simple 9m wide entrance, the W, more curved like a passage entrance, curving to the W and with a 7m wide gap.

Total Number of Breaks Through Ramparts:  
2:   None

Number of Possible Original Entrances:  
2:   None

Guard Chambers:  ✗

Chevaux de Frise:  ✗

Entrances:
1. Simple Gap (East):   None
2. Passage-way/Corridor (West):   None

Enclosing Works

Two cross-bank and ditches running N-S divide the internal area of enclosure into three. Complicated phased construction. Initially, an enclosure with central cross bank and simple gap entrance as its E extremity. Then an E enclosure enclosed by bank and ditch and E entrance built. Finally, the W-most cross bank delineated a smaller fort at this W end. Main bank had a dry-stone revetment with later wall-walk overall, with an outer bank on W. Average width of ramparts and ditches is c. 9.0m. Average overall width of cross-banks and ditches c.12.0m. Banks have strong stone content. Inner banks deteriorated to a scarp across most of the S and SW sides.

Enclosed Area:
Area 1:   1.8ha.
Total:   1.8ha.

Total Footprint Area:  Noneha.

Ramparts

None

Multi-period Enclosure System:
✓   Complicated phased construction.

Ramparts Form a Continuous Circuit:
✓   None

Number of Ramparts:  
NE Quadrant:   1
SE Quadrant:   1
SW Quadrant:   2
NW Quadrant:   2
Total:   2

Morphology

Current Morphology:
Partial Univallate   ✓
Univallate   ✗
Partial Bivallate   ✓
Bivallate   ✗
Partial Multivallate   ✗
Multivallate   ✗
Unknown   ✗

Detailed Morphology:
Partial Univallate   ✗
Univallate   ✓
Partial Bivallate   ✗
Bivallate   ✗
Partial Multivallate   ✗
Multivallate   ✗

Surface Evidence

Wall-walk over main bank.

Enclosing Works (Surface):
None   ✗
Earthen Bank   ✗
Stone Wall   ✗
Rubble   ✗
Wall-walk   ✓
Evidence of Timber   ✗
Vitrification   ✗
Other Burning   ✗
Palisade   ✗
Counter Scarp Bank   ✗
Berm   ✗
Unfinished   ✗
Other   ✗

Excavated Evidence

Main bank had a dry-stone revetment with later wall-walk overall, with an outer bank on W.

Enclosing Works (Excavation):
None   ✗
Earthen Bank   ✓
Stone Wall   ✓
Murus Duplex   ✗
Timber-framed   ✗
Timber-laced   ✗
Vitrification   ✗
Other Burning   ✗
Palisade   ✗
Counter Scarp Bank   ✗
Berm   ✗
Unfinished   ✗
No Known Excavation   ✗
Other   ✓

Other

Gang Working:
✗   None

Ditches:
✓   None

Number of Ditches:  2

Annex:
✗   None

References

Gerrard, C., Wiggins, H., and Evans, E. 2006. Prehistoric defended enclosures in Glamorgan with recommendations for fieldwork: Year 3 Report, GGAT Report No. 2006/089, Project No. GGAT78, Swansea: GGAT.

Howell, R. 2006: Searching for the Silures. An Iron Age tribe in south-east Wales, Stroud: Tempus.

Probert, A. 1976. Twyn-y-Gaer hill-fort, Gwent: an interim assessment, in Boon, G.C. and Lewis, J.M. (eds.), Welsh antiquity, essays presented to Dr H.N. Savory, Cardiff: National Museum of Wales, 105-20.

Savory, H.N. 1950. List of hill-fort and other earthworks in Wales, II. Monmouthshire, Bull Board Celtic Stud, 13, 234.

Whittle 1992: A guide to ancient and historic Wales - Glamorgan and Gwent, London: HMSO, 43.



Terms of Use

This work is licensed under CC BY-SA 4.0 and should be cited as:

Lock, Gary and Ralston, Ian. 2024. Atlas of Hillforts of Britain and Ireland. Available at: https://hillforts.arch.ox.ac.uk


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