Bryn Derwen Motte, Llandyssil

Has been described as a Possible Timber Castle (Motte)

There are cropmark/slight earthwork remains

NameBryn Derwen Motte, Llandyssil
Alternative NamesBryn Derwyn
Historic CountryMontgomeryshire
Modern AuthorityPowys
1974 AuthorityPowys

A greatly mutilated motte and bailey, resting on steep rivurine scarps to the W, where the motte (?c.38m in diameter) appears to have been almost entirely robbed, leaving traces of its ditch and counterscarp, c.67-72m in diameter. The area of the bailey (c.70m square) to the NE is occupied by buildings belonging to Bryn Derwen. (Coflein)

A much mutilated motte and bailey, situated on the east bank of the River Severn. The motte is completely destroyed, with its position marked by a hollow. The only remaining bank of the bailey goes across the northeast end of the site. The site consists of one main bank running around from northeast to southeast. The bank above the natural slopes on the west, measures 65.0m long, is 6.0 to 10.0m wide and up to 18.0m high. The bank on the north side encloses a slight hollow 1.0m below the outside ground level, which is thought to be the last remnant of the motte, but only its southern bank remains. South of the motte area is a bank or steepened slope, but it is difficult to determine whether this is part of the motte and bailey (Cadw 1998). Earthworks relating to former Motte and Bailey. (Thomas D, 1998b). (Clwyd Powys Archaeological Trust HER)

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 ReferenceSO163952
HyperLink HyperLink HyperLink
Copyright Dave Barlow of Abaroths World All Rights ReservedView full Sized Image
Copyright Dave Barlow of Abaroths World All Rights ReservedView full Sized Image

Most of the sites or buildings recorded in this web site are NOT open to the public and permission to visit a site must always be sought from the landowner or tenant.

Calculate Print


  • Morgan, Gerald, 2008, Castles in Wales: A Handbook (Talybont: Y Lolfa Cyf.) p. 244 (listed)
  • Salter, Mike, 2001, The Castles of Mid Wales (Malvern) p. 36
  • King, D.J.C., 1983, Castellarium Anglicanum (London: Kraus) Vol. 1 p. 297
  • RCAHMW, 1911, An inventory of the Ancient Monuments of Montgomeryshire (HMSO) p. 77 no. 386 online copy


  • Spurgeon, C.J., 1966, ‘The castles of Montgomeryshire’ Montgomeryshire Collections Vol. 59 p. 19 online copy
  • 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
  • Clark, G.T., 1880, 'The moated mounds of the Upper Severn' Archaeologia Cambrensis Vol. 35 p. 211-2 (reprint of Montgomeryshire Collections article) online copy
  • Clark, G.T., 1877, 'The moated mounds of the upper Severn' Montgomeryshire Collections Vol. 10 p. 342-3 online copy


  • Thomas, D., 1998, South Twyi/Irfon/Crychan/Glasfynydd Archaeological Assessment