of Aquitaine and betrothed his only daughter Petronilla of Aragon to Raymond Berenguer IV, Count of Barcelona. The wedding agreement provided Berenguer with the title of Princeps Aragonum and Dominator Aragonensis (Ruler of the Kingdom and Commander of the Aragonese Military) but the title of King of Aragon was reserved for Ramiro II and Berenguer's future sons. Raymond Berenguer IV, the first ruler of the united dynasty, called himself Count of Barcelona and "Prince of Aragon". Expansion Alfonso II inherited two realms and with them, two different expansion processes. The House of Jiménez looked south in a battle against Castile for the control of the middle valley of the Ebro in the Iberian peninsula. The House of Barcelona looked north to its origins, Occitania, where through family ties it had significant influence, especially in Toulouse, Provence and Foix, towards the south along the Mediterranean coast and towards the Mediterranean sea. Soon, Alfonso II of Aragon and Barcelona committed to conquering Valencia as the Aragonese nobility demanded. Like his father, he gave priority to the expansion and consolidation of the House of Barcelona's influence in Occitania. Alfonso II signed the treaties of Cazorla, a multilateral treaty between Navarre, Aragón, León, Portugal, and Castile to redefine the frontiers and zones of expansion of each kingdom. Alfonso II assured Valencia by renouncing the Aragonese rights of annexing Murcia in exchange for securing the Aragonese frontier with Castile. This action should be seen as result of the aforementioned priority given over the Occitan and Catalan dominions of the Crown of Aragon. From the ninth century, the dukes of Aquitaine, the kings of Navarre, the counts of Foix, the counts of Toulouse and the counts of Barcelona were rivals in their attempts at controlling the various counties of the Hispanic Marches and pays of Occitania. And the House of Barcelona succeeded in extending its influence to the area that is now south of France through strong family ties, in the areas of the County of Provence, County of Toulouse and County of Foix. The rebellion of the Cathars or Albigensians, who rejected the authority and teachings of the Catholic Church, led to the loss of these possessions in southern France. Pope Innocent III called upon Philip II of France to suppress the Albigensians—the Albigensian Crusade, which led to bringing Occitania firmly under the control of the King of France, and the Capetian dynasty from northern