In 1143, Becket joined the household of Theobald of Bec, as a clerk. He became Archbishop of Canterbury in 1162. He had been a close friend of King Henry II, but they argued about the rights of the Church. This argument between Henry and Becket ended their friendship. Becket resigned as Lord Chancellor and sought to extend the rights of the archbishopric. This led to a series of conflicts with the King. One was on the jurisdiction of secular courts over English clergymen. 