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.
Hundred Years' War
Henry IV of England died in 1413 and was replaced by his eldest son Henry V. The mental illness of Charles VI of France allowed his power to be exercised by royal princes whose rivalries caused deep divisions in France. Henry V was well aware of these divisions and hoped to exploit them. In 1414 while he held court at Leicester, he received ambassadors from Burgundy. Henry accredited envoys to the French king to make clear his territorial claims in France; he also demanded the hand of Charles VI's youngest daughter Catherine of Valois. The French rejected his demands, leading Henry to prepare for war.