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In page Catharism:

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This war pitted the nobles of France against those of the Languedoc. The widespread northern enthusiasm for the Crusade was partially inspired by a papal decree that permitted the confiscation of lands owned by Cathars and their supporters. This angered not only the lords of the south,[7] but also the King Philip II of France, who was at least nominally the suzerain of the lords whose lands were now open to seizure. King Philip II wrote to Pope Innocent in strong terms to point this out—but Pope Innocent refused to change his decree. As the Languedoc was supposedly teeming with Cathars and Cathar sympathisers, this made the region a target for northern French noblemen looking to acquire new fiefs.[citation needed]