LiDAR 1m DTM Hillshade
Satellite Imagery
LiDAR 1m DTM Hillshade
Satellite Imagery
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HER: Clwyd Powys 450 (None)
NMR: SO 03 NW 1 (92047)
SM: BR052(POW)
NGR: SO 02083 38027
X: 302083 Y: 238027 (OSGB36)
Small, oval and high, bivallate contour hillfort located on a spur of the Allt Arnog ridge above the Afon Honddu at Alltarnog. Surrounding slopes N, E moderate to strong, S precipitous, W steep. Opposite to Gaer Fach, Merthyr Cynog (Atlas No. 1308). Measures c.150m by 35m with internal area 0.48ha. No rampart on the precipitous S side. Elsewhere is a degraded curving bank and ditch, and 5m-10m from ditch is scarp, possibly representing a further line of rampart, now much degraded to 2.75m high. A shelf running for its length outside, probably line of ditch. Banks composed of earth and rubble. Indications of a inner quarry ditch, but no other features visible in the interior. Inner bank to 0.9m high internal and external to 3m high, best on W. Possible slight counterscarp on E. E entrance with simple gap through ramparts. Under improved grassland, but ramparts well-preserved despite plough damage. On 1st Ed. OS map (1888). Few investigations. Undated.
Citizen Science: ✗
Reliability of Data: Confirmed
Reliability of Interpretation: Confirmed
X: -381690 Y: 6805903 (EPSG: 3857)
Longitude: -3.4287757739461564 Latitude: 52.03194126699737 (EPSG:4326)
Country: Wales
Current County or Unitary Authority: Powys
Historic County: Brecknockshire
Current Parish/Community/Council/Townland: Merthyr Cynog
Improved grassland, but defences well-preserved despite plough damage, especially to the outer ditch. Modern field bank and ditch on W end.
| Extant | ✓ |
| Cropmark | ✗ |
| Likely Destroyed | ✗ |
Improved grassland.
| Woodland | ✗ |
| Commercial Forestry Plantation | ✗ |
| Parkland | ✗ |
| Pasture (Grazing) | ✓ |
| Arable | ✗ |
| Scrub/Bracken | ✗ |
| Bare Outcrop | ✗ |
| Heather/Moorland | ✗ |
| Heath | ✗ |
| Built-up | ✗ |
| Coastal Grassland | ✗ |
| Other | ✗ |
Small, oval and high, contour hillfort located on a spur of the Allt Arnog ridge above the Afon Honddu. Surrounding slopes N, E moderate to strong, S precipitous, W steep.
| Contour Fort | ✓ |
| Partial Contour Fort | ✗ |
| Promontory Fort | ✗ |
| Hillslope Fort | ✗ |
| Level Terrain Fort | ✗ |
| Marsh Fort | ✗ |
| Multiple Enclosure Fort | ✗ |
| Hilltop | ✗ |
| Coastal Promontory | ✗ |
| Inland Promontory | ✗ |
| Valley Bottom | ✗ |
| Knoll/Hillock/Outcrop | ✗ |
| Ridge | ✗ |
| Cliff/Plateau-edge/Scarp | ✗ |
| Hillslope | ✗ |
| Lowland | ✗ |
| Spur | ✓ |
Dominant Topographic Feature: Spur
| North | ✗ |
| Northeast | ✗ |
| East | ✗ |
| Southeast | ✗ |
| South | ✗ |
| Southwest | ✗ |
| West | ✗ |
| Northwest | ✗ |
| Level | ✓ |
Altitude: 387.0m
N/A
None.
Reliability: D - None
| Pre 1200BC | ✗ |
| 1200BC - 800BC | ✗ |
| 800BC - 400BC | ✗ |
| 400BC - AD50 | ✗ |
| AD50 - AD400 | ✗ |
| AD400 - AD 800 | ✗ |
| Post AD800 | ✗ |
| Unknown | ✓ |
| Pre Hillfort: | None |
| Post Hillfort: | None |
On 1st Ed. OS map (1888). RCAHMW investigation 1968. CPAT defended enclosures survey 2006-2007.
| 1st Identified Map Depiction (1888): | OS map. |
| Other (1968): | RCAHMW investigation. |
| Other (None): | CPAT defended enclosures survey |
Quarry ditch.
Stream 0.4km outside fort.
| None | ✓ |
| Spring | ✗ |
| Stream | ✗ |
| Pool | ✗ |
| Flush | ✗ |
| Well | ✗ |
| Other | ✗ |
Quarry ditch.
| No Known Features | ✗ |
| Round Stone Structures | ✗ |
| Rectangular Stone Structures | ✗ |
| Curvilinear Platforms | ✗ |
| Other Roundhouse Evidence | ✗ |
| Pits | ✗ |
| Quarry Hollows | ✓ |
| Other | ✗ |
None
| No Known Excavation | ✓ |
| Pits | ✗ |
| Postholes | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Roads/Tracks | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
| Nothing Found | ✗ |
None
| No Known Geophysics | ✓ |
| Pits | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Roads/Tracks | ✗ |
| Quarry Hollows | ✗ |
| Other | ✗ |
| Nothing Found | ✗ |
None
| No Known Finds | ✓ |
| Pottery | ✗ |
| Metal | ✗ |
| Metalworking | ✗ |
| Human Bones | ✗ |
| Animal Bones | ✗ |
| Lithics | ✗ |
| Environmental | ✗ |
| Other | ✗ |
None
| APs Not Checked | ✓ |
| None | ✗ |
| Roundhouses | ✗ |
| Rectangular Structures | ✗ |
| Pits | ✗ |
| Postholes | ✗ |
| Roads/Tracks | ✗ |
| Other | ✗ |
E entrance with simple gap through ramparts.
| 1: | None |
| 2: | None |
Guard Chambers: ✗
Chevaux de Frise: ✗
| 1. Simple Gap (East): | None |
No ramparts on the precipitous S side, with elsewhere degraded bank and ditch, with scarps possibly representing a further line of banks and ditches. Slight counterscarp on E.
| Area 1: | 0.48ha. |
| Total: | 0.48ha. |
Total Footprint Area: Noneha.
None
| ✗ | None |
| ✗ | None |
| NE Quadrant: | 2 |
| SE Quadrant: | 0 |
| SW Quadrant: | 0 |
| NW Quadrant: | 2 |
| Total: | 2 |
| Partial Univallate | ✗ |
| Univallate | ✗ |
| Partial Bivallate | ✓ |
| Bivallate | ✗ |
| Partial Multivallate | ✗ |
| Multivallate | ✗ |
| Unknown | ✗ |
| Partial Univallate | ✗ |
| Univallate | ✗ |
| Partial Bivallate | ✗ |
| Bivallate | ✗ |
| Partial Multivallate | ✗ |
| Multivallate | ✗ |
Slight counterscarp on E. Earth and rubble banks.
| None | ✗ |
| Earthen Bank | ✓ |
| Stone Wall | ✗ |
| Rubble | ✓ |
| Wall-walk | ✗ |
| Evidence of Timber | ✗ |
| Vitrification | ✗ |
| Other Burning | ✗ |
| Palisade | ✗ |
| Counter Scarp Bank | ✓ |
| Berm | ✗ |
| Unfinished | ✗ |
| Other | ✗ |
None
| None | ✗ |
| Earthen Bank | ✗ |
| Stone Wall | ✗ |
| Murus Duplex | ✗ |
| Timber-framed | ✗ |
| Timber-laced | ✗ |
| Vitrification | ✗ |
| Other Burning | ✗ |
| Palisade | ✗ |
| Counter Scarp Bank | ✗ |
| Berm | ✗ |
| Unfinished | ✗ |
| No Known Excavation | ✓ |
| Other | ✗ |
| ✗ | None |
| ✓ | Shelf, running along line of outer rampart, possibly site of ditch. |
Number of Ditches: 2
| ✗ | None |
Savory, H.N. 1952. List of Hill-forts and other earthworks in Wales, III, Brecknockshire, Bull Board Celtic Stud, 14, 72.
Silvester, B. 2007. The Clwyd-Powys Archaeological Trust. Defended enclosures in Brecknock, CPAT Report No 859, Welshpool: CPAT.
RCAHMW 1986. An inventory of the ancient monuments in Brecknock (Brycheiniog). The Prehistoric and Roman monuments, Vol 1, Part 2, Hill-forts and Roman remains, HF 37, London: HMSO.
Atlas of Hillforts:
Wikidata:
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
Document Version 1.1