Marcianus of Arles
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Marcianus of Arles or Marcion of Arles was the 3rd-century bishop of Arles who later converted to Novatianism. After his conversion, Faustinus, bishop of Lyon denounced him, and Cyprian wrote a letter to Stephen, exhorting the Roman bishop to join in the excommunication of Marcion, so that when he has been excommunicated, another bishop may be elected in his place.[1][2][3] However, despite the Gallic bishops denouncing Marcianus, Pope Stephen I refused to excommunicate him.[4]