king Henry and Thomas Beckett were very good friends.
king Henry had made Thomas Beckett his chancellor.
After being the chancellor king Henry had made Thomas Beckett the archbishop because he thought the church courts were being too soft so he made one of his closest friends be in charge.
King Henry had asked Thomas if he can change the court laws to a more strict and tough way but Thomas did not agree so they had got into a big argument and Thomas had fled to France.
Beckett had returned to Canterbury and King Henry and Thomas had decided to work things out. Until Beckett had fired all the bishops who had helped Henry.
when Henry had found out he was fuming and shouted "is there no one who will rid me of this troublesome priest." There were 4 knights that overheard and decided that they could get rid of this priest, and they set off to Canterbury without doubt. They killed him while he was praying.