Thomas Becket was a high leader of the Catholic Church. He was a saint. Specifically, he was the archbishop of Canterbury. Becket was born in the early 1100s and he was part of the Anglican Communion. During this time, you never would go against the king of England. The king of England ruled and could punish people severely if he felt that something did wrong. Becket had trouble with Henry II.
One punishment King Henry II did was to kick leaders in the church out of the church due to the trouble he felt like they were causing him. On December 29, 1170, the king sent his knights to Becket requiring him to describe what he did wrong. When he refused he was killed by the knights.