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.
Late Middle Ages
From 1337, England's attention was largely directed towards France in the Hundred Years' War. Henry V's victory at the Battle of Agincourt in 1415 briefly paved the way for a unification of the two kingdoms, but his son Henry VI soon squandered all previous gains. The loss of France led to discontent at home. Soon after the end of the war in 1453, the dynastic struggles of the Wars of the Roses (c. 1455–1485) began, involving the rival dynasties of the House of Lancaster and House of York.