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.
Treaty of Tours
The Hundred Years' War (1337–1453) now raged for more than a century between the houses of Valois and Plantagenet, who were both contesting the throne of France. In 1420, the Treaty of Troyes was signed which stipulated the marriage of Henry V of England to Catherine of Valois, daughter of Charles VI of France, and also stated that Henry and his heirs would inherit the throne of France upon Charles VI’s death. With the death of both kings in 1422, the thrones of France and England passed to the infant Henry VI of England, son of Henry V and maternal grandson of Charles VI. Charles of Valois, son of Charles VI, disputed his dispossession of the French kingdom, and claimed the French throne as Charles VII. The military efforts conducted by Charles against the territories held by the English in France rendered the treaty of Troyes moot and the Hundred Years' War continued.