|Rhuddlan, Denbighshire, Wales|
|Coordinates||grid reference SJ026776|
|Type||Motte and bailey|
It remained in use for two hundred years until Rhuddlan Castle was built, adjacent to Twthill, on the orders of Edward I. Tradition has it that Twthill Castle was built on the site of Gruffydd ap Llywelyn's palace.
Only the motte mound remain today to the south of Rhuddlan Castle, standing 12 metres high with a maximum diameter of 80 metres, although impressions of the Bailey can been seen in the surrounding fields. Much of the site has degraded due to the sandy soil conditions.
It is currently in the care of Cadw and is open to the public.
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- Castles of Wales, information and photographs of Twthill
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