Henry the Young King
Hugh de Morville was granted the Honour of Knaresborough in 1158. He was constable of Knaresborough and leader of the group of four knights who murdered Archbishop Thomas Becket at Canterbury Cathedral on 29 December 1170. The four knights fled to Knaresborough and hid at the castle. Hugh de Morville forfeited the lands in 1173, not for his implication in the murder of Thomas Becket, but for "complicity in the rebellion of Henry the Young King", according to the Early Yorkshire Charters.