This Proclus probably introduced Montanism into Rome at the beginning of the third century. According to Pseudo-Tertullian (Adv. omnes Hær. chap. 7) he was a leader of one division of the Montanists, the other division being composed of followers of Æschines. He is probably to be identified with the Proculus noster, classed by Tertullian, in Adv. Val. chap. 5, with Justin Martyr, Miltiades, and Irenæus as a successful opponent of heresy.