In Christian theology, a heresiarch (also hæresiarch, according to the Oxford English Dictionary; from Greek: αἱρεσιάρχης, hairesiárkhēs via the late Latin haeresiarcha) is an originator of heretical doctrine, or the founder of a sect that sustains such a doctrine. For example, Marcion, the founder of Marcionism, and Pelagius, the founder of Pelagianism, were classed as heresiarchs. According to Orthodox doctrine, the Pope of Rome is likewise a heresiarch.
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- ^ a b Cross and Livingstone, Oxford Dictionary of the Christian Church 1974