John II, called John the Good, was King of France from 1350 until his death in 1364. When he came to power, France faced several disasters: the Black Death, which killed between a third and a half of its population; popular revolts known as Jacqueries; free companies of routiers who plundered the country; and English aggression during the Hundred Years' War that resulted in catastrophic military losses, including the Battle of Poitiers of 1356, in which John was captured.