Heracleon

Heracleon was a Gnostic who flourished about AD 175, probably in the south of Italy. He is described by Clement of Alexandria (Strom. iv. 9) as the most esteemed (δοκιμώτατος) of the school of Valentinus; and, according to Origen (Comm. in S. Joann. t. ii. § 8, Opp. t. iv. p. 66), said to have been in personal contact (γνώριμος) with Valentinus himself. He is barely mentioned by Irenaeus (ii. 41) and by Tertullian (adv. Valent. 4). The common source of Philaster and Pseudo-Tertullian (i.e. probably the earlier treatise of Hippolytus) contained an article on Heracleon between those on Ptolemaeus and Secundus, and on Marcus and Colarbasus.