France. Peter II of Aragon returned from the Battle of Las Navas de Tolosa in autumn 1212 to find that Simon de Montfort, 5th Earl of Leicester, had conquered Toulouse, exiling Count Raymond VI of Toulouse, who was Peter's brother-in-law and vassal. Peter's army crossed the Pyrenees and arrived at Muret where they were joined by Raymond of Foix and Raymond of Toulouse's forces, in September 1213 to confront Montfort's army. The Battle of Muret began on 12 September 1213. The Catalan, Aragonese and Occitan forces were disorganised and disintegrated under the assault of Montfort's squadrons. Peter himself was caught in the thick of fighting, and died as a result of a foolhardy act of bravado. Thus, the nobility of Toulouse, Foix and other vassals of the Crown of Aragon were defeated. The conflict concluded with the Treaty of Meaux-Paris in 1229, in which the Crown of Aragon agreed to renounce its rights over the south of Occitania with the integration of these territories into the dominions of the King of France. King James I (13th century) returned to an era of expansion to the South, by conquering and incorporating Majorca, Ibiza, and a good share of the Kingdom of Valencia into the Crown. With the Treaty of Corbeil (1258), which was based upon the principle of natural frontiers, the Capetians were recognized as heirs of the Carolingian dynasty, and the Capetian king Louis IX renounced any claim of feudal overlordship over Catalonia. The general principle was clear, Catalan influence north of the Pyrenees, beyond the Roussillon, Vallespir, Conflent and Capcir, was to cease. James I had realized that wasting his forces and distracting his energies in attempts to keep a footing in France would only end in disaster. In January 1266, James I besieged and captured Murcia, then settled his own men, mostly Catalans, there; and handed Murcia over to Castile with the treaty of Cazorla. The Kingdom of Majorca, including the Balearic Islands, and the counties of Cerdanya and Roussillon-Vallespir and the city of Montpellier, was held independently from 1276 to 1279 by James II of Majorca and as a vassal of the Crown of Aragon after that date until 1349, becoming a full member of the Crown of Aragon from 1349. Valencia was finally made a new kingdom with its own institutions and not an extension of Aragón as the Aragonese noblemen had intended since even before