(340-420) Prolific author. In his letter to Pammachius and Oceanus, he becomes a critic of Gnostics and Origen, although he is known to have studied the works of Valentinus, Marcion, Menander, and others. "On the ground taken by these persons we have no right to condemn Valentine, Marcion, or the Cataphrygians, or Manichaeus, none of whom are named by the council of Nicea, and yet there is no doubt that in time they were prior to it". http