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Cof Cymru: National Historic Assets of Wales · Wales

Plas Yr Alarch Moated Site

Castle Caereinion, Powys, Wales

A scheduled monument in Castle Caereinion, Powys, recorded as Moated Site (Medieval).

Ordnance Survey six-inch map, 2nd edition (1888–1913) covering the location of Plas Yr Alarch Moated Site, Castle Caereinion, 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
Moated Site
Period
Medieval
Date of designation
4 September 1992
Community
Castle Caereinion
Unitary authority
Powys
Country
Wales
Coordinates (centre of the scheduled area)
52.62794, -3.21258
SAM number
MG219
Cadw record number
487

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 1795 map "To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most humbly inscribed by his obedient humble servant" (Llyfrgell Genedlaethol Cymru – The National Library of Wales).

Historical maps covering this location

  • 1795 · To Sir Watkin Williams-Wynn Bart ... the map of the six counties of North Wales is most… (Llyfrgell Genedlaethol Cymru – The National Library of Wales)
  • 1883 · Watershed map England, Wales 3. (David Rumsey Map Collection, Stanford Libraries)
  • 1899 · 151 Welshpool (Hills) (David Rumsey Map Collection, Stanford Libraries)
  • 1901 · Sheet 9 and 10. (David Rumsey Map Collection, Stanford Libraries)
  • 1916 · Sheet 60. Shrewsbury. (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 monument.

The monument comprises the remains of a well-preserved medieval moated homestead. Plas yr Alarch is very well-defined by ditches on the E, W and S sides. On the W side, the ditch is 7m wide, c.1.0m deep and is bounded by a 4m wide bank on the outside which extends to the S beyond the moated area. On the southern side, the ditch is 5m wide and 0.9m deep. On the E side, the ditch broadens from being 4.0m at the S end to 7m at its N end. The eastern ditch is bounded by a slight mound. The interior slopes slightly and has a square platform at its N end which is partly defined by discontinuous lengths of stones set into the turf, clearly the basal remains of a stone-built structure probably of late post medieval date.

The monument is of national importance for its potential to enhance our knowledge of medieval settlement. The monument is well preserved and is an important relic of the medieval landscape. It retains significant archaeological potential, with a strong probability of the presence of intact archaeological deposits and structural evidence.

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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