This kingdom sent an emissary to the court of Abaqa Khan in an ill-fated attempt to organize what would become known as the 1269 Crusade of the Infants. A group of soldiers from this kingdom defeated the Karasid beylik at the 1303 Battle of Cyzicus and seized the lands of Walter V around Athens after the Battle of Halmyros. A ruler of this kingdom was killed after his army’s defeat at the Battle of Muret, (-5[1])the last major battle of the Albigensian Crusade. This kingdom changed dynasties when its queen Petronilla married Count Ramon Berenguer IV. After anti-French riots, Peter III of this kingdom defeated Charles I of Anjou in the War of the Sicilian Vespers. This kingdom’s ruler James I conquered (10[1])Valencia from the Almohads. For 10 points, name this Spanish kingdom (10[1])that was ruled by Ferdinand (10[1])II when he married (10[1])Isabella of Castille. ■END■