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Castell Trefadog

Also known as, or recorded in historical documents as;
Porth Trefadog

In the community of Llanfaethlu.
In the historic county of Anglesey.
Modern authority of Anglesey.
Preserved county of Gwynedd.

OS Map Grid Reference: SH29088590
Latitude 53.34228° Longitude -4.56874°

Castell Trefadog has been described as a probable Timber Castle.

There are earthwork remains.

This site is a scheduled monument protected by law.


Very heavily-defended coastal site. Recent excavation revealed the foundations of C14 stone house inside an enclosure. An unusual site, perhaps akin to Penmaen Castle, Gower. Some have suggested a Viking origin for the site, others call it native welsh. Undergoing coastal erosion. In CARN listed as early medieval promontory fort, prehistoric coastal promontory fort and unknown fort.

A natural coastal knoll has been enhanced with a rampart and ditch to form a promontory fort. The knoll has been eroded by the sea on the north-west and north-east and only a near square area about 18m across remains of what may have been a rather larger enclosure. The 1.8m deep ditch on the south-east side takes advantage of a natural gully and on this side the rampart rises 3.4m from the ditch bottom. Slighter banks on the noth-east and north-west sides are probably old field boundaries. No finds are known from the site and its original date is unknown. It is perhaps most likely to be a later Prehistoric or Roman period fort. The traditional identification as a medieval earthwork castle ('Castell - site of': on OS County series 1st edition (Anglesey V.12 1889)) is perhaps unlikely. (Coflein–John Wiles 13.08.07)

A defended site with the sea on the N and W sides, a natural gully to the SE and a massive bank and ditch to the SW. The site has recently been excavated, and was shown to have comprised a level promontory defended by a bank, now surviving to a height of 2 m, inside a ditch 13 m wide and 4 m deep. The interior occupies some 250 sq. m, but some on the NW side has been lost through erosion of the cliff face. A large rectangular structure with rounded corners occupies the NW part of the interior. (Scheduling Report)
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Sources of information, references and further reading
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This record last updated 05/07/2016 10:41:44