Richard the Lionheart and Saladin
Though remembered lovingly in Robin Hood movies, Richard the Lionheart was a complex figure. He believed that the Holy Land should be under Christian rule with such fervor that he waged perhaps the most legendary military campaign of all time—the Third Crusade. There was just one problem: Saladin, the wise, fierce Sultan of the Muslims. A brilliant war leader, Saladin was not going to let some random Englishman conquer his home as part of Bible Study, and his army roundhouse kicked the Christian invaders multiple times. Like Napoleon and Wellington, Lionheart and Saladin grew to respect each other hugely; the famously merciful Sultan even provided Richard with medical treatment when he fell victim to plague.