Twthill castle was built to a 'motte and bailey' design and was erected by Robert of Rhuddlan in 1073. He was a kinsman of Hugh d'Avranches, Earl of Chester and the castle was designed to consolidate Norman advances into the north of Wales at the command of William the Conqueror.
Twthill Castle was constructed to solidify Norman control over northern Wales, designed by Robert of Rhuddlan, who was related to Hugh d'Avranches, Earl of Chester, under the command of William the Conqueror.