A pivotal moment in the history of the cathedral was the murder of the archbishop, Thomas Becket, in the north-west transept (also known as the Martyrdom) on Tuesday 29 December 1170, by knights of King Henry II. The king had frequent conflicts with the strong-willed Becket and is said to have exclaimed in frustration, "Will no one rid me of this turbulent priest?" Four knights took it literally and murdered Becket in his own cathedral. After the Anglo-Saxon Ælfheah, Becket was the second Archbishop of Canterbury to be murdered.