9. Richard the Lionheart vs. King John
The turbulent relationship between brothers Richard I and John sowed seeds of civil war and shaped the English monarchy for generations. John’s frequent betrayals during Richard’s crusade returned as infamous tales of royal backstabbing. For instance, during Richard’s absence, John sought alliances with King Philip II of France, aiming to seize Richard’s territories. This treachery led to John’s temporary loss of lands upon Richard’s return. (nationalgeographic.com)
