William de Tornebu was a knight who served under King Richard I of England during the Crusades.

He was wounded in El Akir's ambush in 1190. His injuries were treated by the First Doctor and Vicki Pallister, who took him back to Richard's palace at Jaffa. He later helped the Doctor to persuade the King to let Ian Chesterton go to Saladin's encampment at Ramlah to search for Barbara Wright. (TV: The Crusade)