Faustinus bishop of Lyons, lived in the second part of the third century. He became bishop about the year 250, and distinguished himself by his zeal far the faith, and the ardor with which he attacked Marcianus, bishop of Arles, the only Gallic bishop who had embraced Novatianism. Unable to accomplish anything by himself, he made sure of the aid of the bishops of the Narbonnaise, and wrote to the pope, Stephen, to obtain the deposition of Marcianus. The pope hesitated, and Faustinus, in order to hasten matters, wrote to Cyprian, bishop of Carthage. The two letters which he wrote no longer exist, but they form the material of the sixty-seventh letter of Cyprian to pope Stephen, which gives a curious picture of the Gallic Church at that period. Marcianus persisted in his schism, and the result of the affair is uncertain, but it is probable that he was deposed, since his name is not found in the list of the bishops of Arles.-Hoefer, Nouv. Biog. Generale, 17:199.