Ruthin Castle is a medieval castle fortification in Wales, near the town of Ruthin in the Vale of Clwyd. It was constructed during the late 13th century by Dafydd, the brother of Prince Llywelyn II, on a red sandstone ridge overlooking the valley.The castle was most notably the base of that branch of the noble de Grey family accorded the title "Barons Grey de Ruthyn" and the head of their marcher lordship of Dyffryn Clwyd.
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