Hen Domen was built after 1071, when Roger de Montgomery, the first Earl of Shrewsbury, received extensive areas of Shropshire from king William the Conqueror. Archaeological excavations suggest that the construction was completed before 1100. Roger called the castle Montgomery just like the town in France, from which he arrived. Its current Welsh name means “Old Mound”.
Roger died in 1094, handing over the property to a son named Hugh. A year later Hen Domen was plundered by Cadwgan Bleddyn, the Welsh prince of Powys. A few years later Hugh was killed off the coast of Anglesey in the fight against Norwegians, and his successor was his elder brother Robert. As he took part in the anti-royal conspiracy, he was imprisoned and died in the dungeon of king Henry at Corfe Castle. Hen Domen was from 1105 the seat of the de Boulers family (Bowdler). Around 1223, a new stone castle was erected at a distance of 1.5 kilometers, and the older timber site probably functioned until the end of the 13th century.
The outer bailey occupied an oval area of about 50 by 40 meters, surrounded by a dry moat, 2.7 meters deep. Motte, an artificially built mound, was located in the south-west corner. It was 8 meters high, with steep edges and a flat peak with a diameter of 6.7 meters. There was a timber keep in a tower-like character on it, connected by a bridge with an outer bailey. This bridge came to a large, probably two-story building measuring 5×6 meters. The remaining buildings were a timber palisade surrounding the castle, a timber tower near the mound and a gatehouse on the south side.
The castle has not survived to modern times, the only remnant of it is an earth mound. It is located on private property and can be visited only with the agree of the owner.
Website coflein.gov.uk, Hen Domen, Montgomery.
Website cpat.org.uk, A short guide to Hen Domen motte and bailey castle.
Website wikipedia.org, Hen Domen.