Four knights, Reginald fitzUrse, Hugh de Morville, William de Tracy and Richard le Breton, murdered Archbishop Thomas Becket in Canterbury Cathedral on 29 December 1170. In the immediate aftermath of the murder, the knights fled to Knaresborough Castle, which belonged to Hugh de Morville. Here they barricaded themselves in and were besieged by forces loyal to King Henry II. After a few days, the knights surrendered and were taken prisoner. They were then transferred to Saltwood Castle, where they were held for some time before being released on bail. The knights subsequently fled to France, where they were given refuge by King Louis VII. Here they remained for some years before eventually being pardoned by King Henry II in 1174. As part of their penance, the knights were required to make a pilgrimage to the Holy Land and to live in exile for a period of time.