On 12 September 1213 the Battle of Muret took place between Simon de Montfort and a coalition force under the control of Count Raymond of Toulouse, and King Peter II of Aragon. Muret entered history. That day, the battle changed the horizons of both sides of the Pyrenean border and saw the fate of Occitania decided. In an era where feudal entities (including the Count of Toulouse and his allies) still believed that they were able to play a role in the control of the southern areas on both slopes of the Pyrenees, the lords of the north of France, who spearheaded the Albigensian Crusade, attempted to impose themselves upon the south and eliminate Catharism.