Plas Cadwgan Mound

Has been described as a Possible Timber Castle (Motte)

There are earthwork remains

NamePlas Cadwgan Mound
Alternative NamesCadwgan Hall Mound
Historic CountryDenbighshire
Modern AuthorityWrexham
1974 AuthorityClwyd

Cadwgan Hall mound is part natural hillock and part earthwork, situated within a small field, lying to the east of a section of Offa's Dyke (DE132). The mound is approximately 42m in diameter and 2.5m high, with the remains of an air-raid shelter cut into the north-west slope of the site. A slight hollow on its west side may be the trace of a ditch. A hoard of armour is traditionally said to have been dug out of the mound. (Coflein ref. Cadw scheduling description. RCAHMW/F.Foster 08.05.2008)

Large mound situated at North edge of knoll about 42m in diameter 2.5m high. Offa's Dyke adjacent to west. Possibly natural. A hoard of armour is traditionally said to have been dug from it. An association with the Dyke is possible. A large earthen mound (5.5m high, 50m dia), apparently the result of excavating material between its west side and the bank of Offa's Dyke, creating a hollow between them. There is no trace of an encircling ditch. On the S and SE sides it has been cut back and its original form can not be seen. It has a flat top. Relationship between the mound and the Medieval structures at Plas Cadwgan is uncertain. Possible that Plas Cadwgan may have occupied the bailey if this was a Medieval motte. It does not resemble a burial mound or a windmill mound. CPAT site visit 28/7/99 - extremely large mound partly utilising a natural spur. Mound has been cut into by farm track on S side, also extending round SE side. Height on S side c.2.5-3m; on N side possibly as much as 6m to base of slope on lower side of spur. World War 2 air raid shelter built into W side. Offa's Dyke runs N-S along field boundary 8m to west. The suggestion that mound material was excavated from E side of the dyke is highly improbable. Location has good visibility all around. The large size suggests a motte rather than a barrow. No trace of ditch or bailey, but due to the topography this would have to lie to S under the area of the farm

Note that air raid shelter is dangerous and in need of demolition/infill (CPAT 1999). Considered to be a natural mound or a Bronze Age barrow by Spurgeon (Manley, J, Grenter, S & Gale, F, 1991, pp171). (Clwyd Powys Archaeological Trust HER)

Gatehouse Comments

Although accepted as a early castle in 1963 the site was rejected as a castle by Hogg and King in 1970. In CA King writes "Likely to be natural, or possibly a barrow." Scheduled as a Motte. Position, on the English side of Offa's Dyke, where a stream and road cross the Dyke, a similar situation to some other mottes on the Dyke. Presumably the lack of encircling ditch was King's reason for dismissing the site but seems likely that this mound (natural rather than barrow) could have been adapted as a motte.

- Philip Davis

This site is a scheduled monument protected by law

Not Listed

The National Monument Record (Coflein) number(s)
County Historic Environment Record
OS Map Grid ReferenceSJ298487
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Copyright Dave Barlow of Abaroths World All Rights Reserved
Copyright Dave Barlow of Abaroths World All Rights Reserved
Copyright Dave Barlow of Abaroths World All Rights Reserved

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  • Morgan, Gerald, 2008, Castles in Wales: A Handbook (Talybont: Y Lolfa Cyf.) p. 253 (listed as possible)
  • Manley, J., Grenter, S. and Gale, F., 1991, The Archaeology of Clwyd
  • King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol. 1 p. 106
  • RCAHMW, 1914, An inventory of the Ancient Monuments of Denbighshire (HMSO) p. 56 no. 178 online copy


  • Hogg, A.H.A. and King, D.J.C., 1970, 'Castles in Wales and the Marches (Additions and corrections to lists published in 1963 and 1967)' Archaeologia Cambrensis Vol. 119 p. 119-124 (reject)
  • Hogg, A.H.A. and King, D.J.C., 1963, 'Early castles in Wales and the Marches: a preliminary list' Archaeologia Cambrensis Vol. 112 p. 77-124