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In Eastern Christianity heresy most commonly refers to those beliefs declared heretical by the first seven Ecumenical Councils.[citation needed] Since the Great Schism and the Protestant Reformation, various Christian churches have also used the concept in proceedings against individuals and groups those churches deemed heretical. The Orthodox Church also rejects the early Christian heresies such as Arianism, Gnosticism, Origenism, Montanism, Judaizers, Marcionism, Docetism, Adoptionism, Nestorianism, Monophysitism, Monothelitism and Iconoclasm.

What reformation was caused by various heretical groups?
unanswerable