The Treaty of Tarascon was an accord between Pope Nicholas IV, Philip IV of France, Charles II of Naples, and Alfonso III of Aragón that was intended to end the Aragonese Crusade, an episode in the War of the Sicilian Vespers. The treaty was signed at Tarascon, halfway between papal Avignon and Arles, on 19 February 1291, six years after Philip's uncle, Charles of Valois, tried to conquer Aragón from Alfonso's father, Peter III of Aragon, in an event called the Aragonese Crusade because it was sanctioned by Nicholas' predecessor, Pope Martin IV. The intent of the signatories in putting an end to hostilities was to prevent Aragonese domination of Sicily, then ruled by Alfonso's brother, James II.