William of York (late 11th century – 8 June 1154) was an English priest and twice Archbishop of York, before and after a rival, Henry Murdac. He was thought to be related to King Stephen of England, who helped to secure his election to the province after several candidates had failed to gain papal confirmation. William faced opposition from the Cistercians, who after the election of the Cistercian Pope Eugene III, had William deposed in favour of a Cistercian, Murdac. From 1147 until 1153, William worked to be restored to York, which he achieved after the deaths of Murdac and Eugene III. He did not hold the province long, dying shortly after his return, allegedly from poison in the chalice he used to celebrate Mass. Miracles were reported at his tomb from 1177. He was canonised in 1226. Early life Born William fitzHerbert in York, William was the son of Herbert of Winchester, or Herbert fitzAlberic, chancellor and treasurer of King Henry I. Most sources say his mother was Emma, half-sister of King Stephen and Henry of Blois, Bishop of Winchester,<ref name=BHOYork>Greenway "Archbishops" Fasti Ecclesiae Anglicanae 1066–1300: Volume 6: York</ref> and that she was an illegitimate daughter of Stephen II, Count of Blois, Stephen's father. New research, however, suggests that Emma may have been a daughter of Hunger fitzOdin, who held lands in Dorset in the Domesday survey. William was born sometime before the 1090s, but the date is unknown. William held the prebendary of Weighton in the diocese of Yorkshire between 27 June 1109 and 24 February 1114. Sometime between 1109 and 1114 he was appointed Treasurer of York. He was also appointed archdeacon of the East Riding of Yorkshire at an unknown date between 1125 and 1133. The influence of his rich and powerful father, who had many landholdings in Yorkshire, may have been of benefit in gaining him these offices at a relatively early age. William apparently held both of these offices until his election as Archbishop. Serving under Archbishop Thurstan of York, William became involved in Thurstan's dispute with King Henry I after Henry demanded that the Archbishops of York accept subordination to the Archbishops of Canterbury. William accompanied Thurstan into exile in Europe and on embassies to the papal court. Reconciliation with Henry allowed a return to York in 1121. A papal ruling in favour of the independence of the Archbishops of York was finally