Cathars, who were the unlucky targets of Innocent’s Albigensian Crusade, had been known in Europe since at least the 1170s, when a grand assembly of Church leaders known as the Third Lateran Council declared the Cathars’ beliefs “a loathsome heresy.” And it was true that these were unorthodox people, who took the tradition of Christian asceticism far beyond what had been developed even by Bernard of Clairvaux’s Cistercians. Their first principles were uncontroversial: Cathars regarded human flesh as by its nature sinful and detestable—a view that, as we have seen, Innocent had once professed
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