Hundred Years' War (1415–53)
The Lancastrian War was the third and final phase of the Anglo-French Hundred Years' War. It lasted from 1415, when King Henry V of England invaded Normandy, to 1453, when the English lost Bordeaux. It followed a long period of peace from the end of the Caroline War in 1389. The phase was named after the House of Lancaster, the ruling house of the Kingdom of England, to which Henry V belonged.
John II of France
In 1355, the Hundred Years' War flared up again. In July 1356, Edward, the Black Prince, son of Edward III of England, took an army on a great "chevauchée" through France. John pursued him with an army of his own. In September the two forces met a few miles southeast of Poitiers.