Philip III of France

Philip III's father, Louis IX, signed the Treaty of Corbeil, which renounced French claims to Catalonia and Roussillon in exchange for Aragonese renunciation of claims to Provence and Languedoc. Philip III inherited this settlement.

Philip III invaded Navarre to enforce his claim as regent for his niece, Joan I of Navarre. He secured control of the kingdom, which later passed to his son Philip IV through marriage, expanding French influence in the Pyrenees.

Philip III led the Aragonese Crusade, a papal-sanctioned invasion of Aragon to depose King Peter III. The French army was defeated at the Battle of the Col de Panissars and forced to retreat, suffering heavy losses. Philip III died during the retreat.