How did Henry II’s inheritance of Aquitaine affect relations with France?

When Henry II married Eleanor of Aquitaine in 1152 and subsequently became king of England in 1154, he united his continental territories—including Normandy, Anjou, and the vast duchy of Aquitaine—under his rule. Although these lands were held as fiefs from the king of France, their concentration in the hands of a single ruler created a significant threat to the French monarchy, which controlled a much smaller area.123

This imbalance of power initiated a long-standing conflict between the English and French crowns. The French kings viewed the English presence on the continent with alarm and worked to weaken the Angevin empire through wars and political maneuvering. Over time, the French monarchy successfully reduced these holdings, eventually leading to the confiscation of Guyenne (a remnant of Aquitaine) in 1337, which served as a primary catalyst for the Hundred Years’ War.31