Simon de Montfort, who was at the head of the expedition, accepted the effects of the Viscount of Béziers, and continued the war against the heretics. In 1213, before the walls of Muret, he defeated Peter II., King of Arragon, an ally of the Albigenses, who was besieging the town, and he afterwards stripped the Count of Toulouse of his domains, against the wish of Innocent III., who would have preferred that the count’s hereditary rights, and still more those of his son, should have been respected. Simon was supported by Louis, son of Philip Augustus, who lost no time in fulfilling the vow which he had made to take up arms against the Manicheans of Languedoc, and, as the battle of Bouvines (1214) had led to a five years’ truce between the Kings of France and England, he joined the Catholic forces in the following year. In 1218 Toulouse rose in revolt, and Simon de Montfort was mortally wounded by a stone during the siege. His son Amaury put himself forward as heir to his father’s domains, and endeavoured to establish his claims to the countships of Béziers and Toulouse, but he eventually abandoned them in favour of the French monarch. Very rigorous measures were taken to put down the heretics. An order issued by the bishop of Toulouse decreed that “the inhabitants of the districts infected with heresy shall pay one mark in silver for every Waldensian found within their boundaries; the house in which he is captured, those in which he has preached, shall be razed to the ground, and the property belonging to the owner of these houses confiscated. The goods of the pervert shall also be confiscated, as well as those appertaining to any person neglecting to wear or to display the two coloured crosses which should be sewn on to the breast of the penitent’s garment.” The Holy See, on its part, was not remaining inactive during this time, as in 1215 the fourth Lateran Council had excommunicated the Manicheans, the Waldenses, and the Albigenses. The third canon of that council declared that “the heretics who are condemned shall be handed over to the secular arm, in order that they may receive their merited punishment; the clerks shall be previously unfrocked.” Just before this council terminated its sittings, Dominic, presented to Pope Innocent III., obtained, as a recompense for the services which he had rendered to the Church militant, leave to found the order of Preaching-Brothers, who from him took the name, by which they are more generally known, of _Dominicans_.