One of the big events that happened during his rule was the killing of Thomas Becket. Henry and Becket were old friends who found themselves in dispute once Becket became the Archbishop of Canterbury. Their dispute was over the role of the Church in England. Becket was trying to increase the power of church courts that had lost power when Henry had made major changes to the legal system. Four knights killed Becket in Canterbury Cathedral. Legend say that the knights had heard Henry say, "Who will rid me of this turbulent (rebellious) priest?"