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.
Royal Arms of England
In 1340, following the extinction of the House of Capet, Edward III claimed the French throne. In addition to initiating the Hundred Years' War, Edward III expressed his claim in heraldic form by quartering the royal arms of England with the Arms of France. This quartering continued until 1801, with intervals in 1360–1369 and 1420–1422.