Treatise on the Passover ; and, Dialogue of Origen with Heraclides and his fellow bishops on the Father, the Son, and the Soul

Heracleon was a Gnostic who flourished about AD 175, probably in the south of Italy. He is the author of the earliest known commentary on a book that would eventually be included in the Christian New Testament with his commentary on the Gospel of John, although only fragmentary quotes survive. He is described by Clement of Alexandria (Strom. 4.9) as the most esteemed (δοκιμώτατος) of the school of Valentinus; and, according to Origen (Comm. in S. Joann.