Proclus (1) (Proculus), a Montanist teacher, and probably the
introducer of Montanism into Rome at the very beginning of the 3rd cent. For
the account given by Tertullian (adv. Prax. 1) of the apparently favourable
reception the new prophesying at first met with at Rome, and its subsequent
rejection, see . Proclus was publicly opposed by Caius, commonly called a Roman presbyter, and the record of their disputation, though now lost, was read by Eusebius, and is mentioned by several other writers. [.] Pseudo-Tertullian states (Haer. 21) that the Montanists were divided into two sections by the Patripassian controversy, Proclus leading the section whose doctrine on that subject agreed with that of the church, and Aeschines the opposite section. This schism among the Montanists is mentioned also by Hippolytus (Ref. viii. 19).
We can scarcely be wrong in identifying Proclus the Montanist with the Proculus
whom Tertullian in his tract against the Valentinians (c. 5) calls "Proculus
noster, virginis senectae et Christianae eloquentiae dignitas." He there refers
to him as one who, like Justin Martyr, Miltiades, and Irenaeus, successfully
confuted heresy. He is also named as a leader of the Montanists by Pacian (Ep. ad Sympron.), and no doubt it is his name which is disguised as Patroclus in the MSS. of Theodoret (Haer. Fab. iii. 2).