Castilian Civil War
Charles V became king in 1364. He supported Henry of Trastámara in the Castilian Civil War, while the Black Prince supported the reigning king, Peter of Castile. The Black Prince won, but Peter refused to pay for his expenses. The Black Prince tried to recover his losses by raising taxes in Aquitaine, which prompted them to appeal to the King of France. War was renewed. The French recovered their territories place after place. When Charles died in 1380, only Calais, Bordeaux and Bayonne were left to the English.