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Cof Cymru: National Historic Assets of Wales · Wales

Gaer Fach

Merthyr Cynog, Powys, Wales

A scheduled monument in Merthyr Cynog, Powys, recorded as Hillfort (Prehistoric).

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Gaer Fach, Merthyr Cynog, Powys, with a pin at the register's coordinates
Ordnance Survey six-inch map, 2nd edition (1888–1913), covering this location. Courtesy of the National Library of Scotland. The pin is ours, placed from the register's coordinates.

The record

Designation
Scheduled monument
Site type
Hillfort
Period
Prehistoric
Community
Merthyr Cynog
Unitary authority
Powys
Country
Wales
Coordinates (centre of the scheduled area)
52.01927, -3.44527
SAM number
BR053
Cadw record number
1721

Slide toward Today to fade the historical sheet and see the modern map underneath.

David Rumsey Map Collection, Stanford Libraries

5 historical maps cover this location, the earliest the 1608 map "(13) Cambriae Typus." (David Rumsey Map Collection, Stanford Libraries).

Historical maps covering this location

  • 1608 · (13) Cambriae Typus. (David Rumsey Map Collection, Stanford Libraries)
  • 1636 · Cornubia : Devonia, Somersetus, Dorcestria, Wiltonia, Glocestria ... (David Rumsey Map Collection, Stanford Libraries)
  • 1856 · 42. Brecon. (David Rumsey Map Collection, Stanford Libraries)
  • 1898 · 213 Brecon (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 14. (David Rumsey Map Collection, Stanford Libraries)

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This record in Cadw's own full report ↗

Cadw's description

The following provides a general description of the Scheduled Ancient Monument.

The monument comprises the remains of a promontory fort, which probably dates to the Iron Age period (c. 800 BC - AD 74, the Roman conquest of Wales). The site comprises a small bivallate fort occupying a prominent position on the summit of a ridge rising to 413m AOD. The ground falls away from the site steeply in all directions, especially on the SE side where there is a sharp drop between 15m and 25m deep. The defences are formed by this natural escarpment on the SE side, and by a single curved bank with an external ditch on all other sides. The partial remains of a second, outer, bank rampart survive at the NE end of the site, curving around the from the escarpment 30m from the inner rampart, and at the SW end where a 20m long stretch of bank lies immediately outside the ditch. The inner rampart bank and ditch have been denuded, with the bank surviving to a maximum height of 1.8m and the ditch only visible as a line of lusher grass outside the bank. The outer ramparts survive to around 2m above the base of the ditch. The ditches are rock cut and the banks constructed from earth and stone rubble, probably quarried from the ditches. The entrance apears to have been at the NE end through a gap in the rampart and the natural escarpment.

The monument is of national importance for its potential to enhance our knowledge of later prehistoric defensive organisation and settlement. The site forms an important element within the wider later prehistoric context and within the surrounding landscape. The site is well preserved and retains considerable archaeological potential. There is a strong probability of the presence of evidence relating to chronology, building techniques and functional detail.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Nearby in the register

Other entries of the same register within about three miles of this one, by straight line.

Designated Historic Asset GIS Data, The Welsh Historic Environment Service (Cadw), 2026-09-07, licensed under the Open Government Licence http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ Cadw, the Welsh Historic Environment Service · Open Government Licence v3.0
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