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Cof Cymru: National Historic Assets of Wales · Wales

Pen y Crogben Earthwork

Llanbrynmair, Powys, Wales

A scheduled monument in Llanbrynmair, Powys, recorded as Enclosure (Roman).

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Pen y Crogben Earthwork, Llanbrynmair, 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
Enclosure
Period
Roman
Community
Llanbrynmair
Unitary authority
Powys
Country
Wales
Coordinates (centre of the scheduled area)
52.52714, -3.68763
SAM number
MG106
Cadw record number
3663

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)
  • 1830 · V.3:11-15:XV. Britisches Reich. A. Kon: England. b. Frstenthum Wales: Shire: 37-40 (David Rumsey Map Collection, Stanford Libraries)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 164 Llanidloes (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 monument consists of a sub-rectangular turf-built bank, c.0.6m high, c.26.5m N-S by 23.5m E-W, enclosing a level central area. There is a single entrance in the north. Excavation in 1961 showed the interior to be covered with a layer of rough metalling and divided by a central roadway. Four large posts at the entrance way are thought to have supported a tower.

The monument is of national importance for its potential to enhance our knowledge of Roman military operations in the area. The potential association with the early exploitation of metal ores in the area further enhances the importance of this site.

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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