The Battle of Castillon is considered as the final battle of which conflict?

The Battle of Castillon was a battle fought on 17 July 1453 in Gascony near the town of Castillon-sur-Dordogne (later Castillon-la-Bataille). A decisive French victory, it is considered to mark the end of the Hundred Years' War. As a result of the battle, the English lost all landholdings in France, except Calais.

The Hundred Years' War was a series of conflicts waged from 1337 to 1453 by the House of Plantagenet, rulers of the Kingdom of England, against the House of Valois, rulers of the Kingdom of France, over the succession of the French throne. Each side drew many allies into the war. It was one of the most notable conflicts of the Middle Ages, in which five generations of kings from two rival dynasties fought for the throne of the largest kingdom in Western Europe. The war marked both the height of chivalry and its subsequent decline, and the development of strong national identities in both countries.