The Capetian–Plantagenet rivalry was a series of conflicts and disputes that covered a period of 100 years (1159–1259) during which the House of Capet, rulers of the Kingdom of France, fought the House of Plantagenet, rulers of the Kingdom of England, over the Plantagenet-held Angevin Empire which at its peak covered around half of the territory within France. Some historians refer to this series of events as the "First Hundred Years' War".