Pen Twr Enclosure, Treflys

Has been described as a Rejected Timber Castle (Ringwork)

There are earthwork remains

NamePen Twr Enclosure, Treflys
Alternative NamesCwm Cowydd; Cefn Gardys
Historic CountryBrecknockshire
Modern AuthorityPowys
1974 AuthorityPowys

On PEN TWR above the E.-W. ridge CEFN GARDYS, 370 m above O.D., is a circular enclosure, probably a ring-cairn, 16.0m in internal diameter, surrounded by a bank of grass-grown earth and small stones 3.1-3.9m wide at the base and 0.3-0.8m high. The interior level rises in the form of a shallow dome slightly above that of the ground outside, but this elevation may be a natural feature. There is a short length (6.5m) of counterscarp bank 2.1m wide and 0.3m high, visible externally on the W. side. Within the N.W. quadrant is a level terrace, 6.5-7.0m wide externally. The site has no ditch, entrance or internal features. The bank is being eroded by sheep. It was first described by G.T.Clark in 1873. Clark placed it above 'Cwm Cowydd' and pointed out that it lay close to an old ridge-way, formerly an extremely important drovers' road. He also believed it to have been a dwelling site, and indeed, its true function will only be ascertained by excavation (Clwyd Powys Archaeological Trust HER)

The Pen Twr Enclosure has been interpreted by some as as a ring cairn, although others have commented that it does not have the appearance of a prehistoric site. It is a circular and embanked enclosure, 16.7m in diameter internally, whose bank is 3.1m to 3.7m wide and 0.3m to 0.6m high. There is no trace of a ditch, entrance or internal features. (Coflein)

Gatehouse Comments

Earlier versions of the Clwyd Powys Archaeological Trust HER identified this as a ? ringwork. Location clearly not that of a medieval castle and record probably represents a poor use of the term 'ringwork' rather than a genuine thought as to medieval date.

- Philip Davis

Not scheduled

Not Listed

The National Monument Record (Coflein) number(s)
County Historic Environment Record
OS Map Grid ReferenceSN896521
HyperLink HyperLink HyperLink

No photos available. If you can provide pictures please contact Castlefacts

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


  • RCAHMW, 1997, An Inventory of the Ancient Monuments in Brecknock (Brycheiniog); The Prehistoric and Roman Monuments, Part i


  • Clark, G.T., 1873, 'Earthworks in Brecknockshire' The Archaeological Journal Vol. 30 p. 264-6 (Plan) online copy