Henry II and Thomas Becket were always best friends. Henry was not in control of the Church, this annoyed him immensely as he wanted punishment in the Church his own brutal way.
Fine, I'll give you another chance.
And so, Henry did something about this. He made his best, most trustworthy friend he knew, the Head of the Church, hoping he would do what Henry would say, to keep their friendship.
Stupid man! How dare he not use my tactics again!
I have an idea...
Henry always had temper issues, but Becket had never seen him as furious as this. Becket knew that he was going to do anything to get his way- even if it meant killing him. For his own protection, Becket left and went to France.
After around 6 years, Becket eventually returned to England. When Henry saw him, he was fuming, but after some thinking, he agreed to work with Becket, but Becket let him down. Again.
Henry started complaining about Thomas disobeying him again, but unfortunately four knights heard him. They got what they thought an incredible idea.