Clifford Castle is in the village of Clifford which lies to the north of Hay-on-Wye in Herefordshire.
This motte and bailey castle was built on a cliff overlooking the River Wye in 1070 by William FitzOsbern. When his heir, Roger of Breteuil, forfeited his lands for rebellion against the king in 1075, the castle was granted to Ralph Tosny who held it directly from the crown. From Ralph, it passed to his son-in-law Richard des Ponts, who took the surname Clifford.
Clifford Castle was the home of Rosamund Clifford (Fair Rosamund), the mistress of Henry II.
It was last used in the 15th century and has fallen into ruins.