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1 day ago · Catharism ( / ˈkæθərɪzəm / KATH-ər-iz-əm; [1] from the Ancient Greek: καθαροί, romanized : katharoí, "the pure ones" [2]) was a Christian quasi- dualist or pseudo- Gnostic movement which thrived in Southern Europe, particularly in northern Italy and southern France, between the 12th and 14th centuries. [3] Denounced as a ...