William de Tracy was one of the four knights who, supposedly at the behest of King Henry II, in 1170 murdered Thomas Becket, Archbishop of Canterbury. His accomplices were  Reginald Fitzurse, Hugh de Morville and Richard le Breton (or de Brito). They afterwards invaded the Archbishop's Palace plundering Papal Bulls and Charters, gold, silver, vestments, books, and utensils employed for the services of the church.Sudeley, Lord (1987) p. 82
