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. (-5[1])A ruler of this kingdom was killed after his army’s defeat at the Battle of Muret, 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 (-5[1])defeated Charles (10[1])I of Anjou in the War of the Sicilian Vespers. This kingdom’s ruler James I conquered Valencia from the Almohads. For 10 points, name this Spanish kingdom that was ruled by Ferdinand II when he married Isabella of Castille. (10[1])■END■ (10[1])