Hen Domen, Welsh, meaning "old mound", is the site of a medieval timber motte-and-bailey castle in Powys, Wales. It is the site of the original Montgomery Castle and was built by Roger de Montgomery in 1070. From 1105 the castle was the home of the de Boulers (Bowdler) family and it is from Baldwin de Boulers that Montgomery gets its Welsh name, Trefaldwyn "The Town of Baldwin". When the castle was rebuilt in stone (1223–1234) it was decided to rebuild it on a rocky promontory a mile to the south-east – the location of the current town of Montgomery, Powys. The Hen Domen site has been extensively excavated.
- Higham, Robert; Barker, Phillip (2000), Hen Domen, Montgomery – A Timber Castle on the English-Welsh Border: A Final Report, University of Exeter Press, ISBN 0-85989-652-8
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