Becket [1964]
This movie tells of the 12th century struggle between former friends King Henry II (Peter O'Toole) and Thomas Becket (Richard Burton), Archbishop of Canterbury.
Burton and O'Toole, 2 of the greatest actors, on top of their game here. Good restored print available on YouTube
"Who will rid me of this turbulent priest!?" is the famous line that Henry cries, late in the movie. The answer is not long in coming.