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In page Catharism:

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The name of Bulgarians (Bougres) was also applied to the Albigensians, and they maintained an association with the similar Christian movement of the Bogomils ("Friends of God") of Thrace. "That there was a substantial transmission of ritual and ideas from Bogomilism to Catharism is beyond reasonable doubt."[3] Their doctrines have numerous resemblances to those of the Bogomils and the Paulicians, who influenced them,[4] as well as the earlier Marcianists, who were found in the same areas as the Paulicians, the Manicheans and the Christian Gnostics of the first few centuries AD. However some scholars, most notably Mark Pegg, suggest it would be erroneous to extrapolate direct, historical connections based on doctrinal similarities perceived by modern scholars.[citation needed]