Treaty of Le Goulet

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The Treaty of Le Goulet was signed by the kings John of England and Philip II of France in May 1200 and aimed to ultimately settle the claims the Angevin kings of England had on French lands. Hence, it aimed to bring an end to the war over the Duchy of Normandy and finalise the new borders of what was left of the duchy, as well as the future relationship of the king of France and the dukes of Normandy. The treaty was a victory for Philip as it asserted his legal claims to overlordship over John's French lands.

The terms of the treaty signed at le Goulet, on the Gueuleton island in the middle of the Seine river near Vernon in Normandy, included clarifications of the feudal relationships binding the monarchs. Philip recognised John as King of England, heir of his brother Richard I, and thus formally abandoned his prior support for Arthur I, Duke of Brittany, the son of John's late brother, Geoffrey II of Brittany. John, meanwhile, formally recognised the new status of the lost Norman territories by acknowledging the Counts of Boulogne and Flanders as vassals of the kings of France, not those of England, and recognised Philip as the suzerain of the continental lands in the Angevin Empire. John also bound himself not to support any rebellions on the part of the counts of Boulogne and Flanders.

Philip had previously recognised John as suzerain of Anjou and the Duchy of Brittany, but with the treaty of le Goulet he extorted 20,000 marks sterling in payment for recognition of John's sovereignty of Brittany.

The Duchy of Aquitaine was not included in the treaty. It was still held by John as heir to his still-living mother, Eleanor. The treaty was sealed with a marriage alliance between the Angevin and Capetian dynasties. John's niece Blanche, daughter of his sister Leonora and Alfonso VIII of Castile, married Philip's eldest son, Louis VIII of France (to be eventually known as Louis the Lion). The marriage alliance only assured a strong regent for the minority of Louis IX of France. Philip declared John deposed from his fiefs for failure to obey a summons in 1202 and war broke out again. Philip moved quickly to seize John's lands in Normandy, strengthening the French throne in the process.