Strategically located at crossings of the River Wye and River Monnow, only a few fragments – ruins of the 12th-century Great Tower and 13th-century hall – remain of this once-important castle.
Mewn safle strategol lle mae Afon Gwy ac Afon Mynwy’n croesi, dim ond ambell ddarn - adfeilion Tŵr Mawr y 12fed ganrif a neuadd y 13eg ganrif - sy’n weddill o’r castell pwysig hwn ers talwm.