Heracleon was a Gnostic who flourished about AD 175, probably in the south of Italy. He's generally classed by the early heresiologists as belonging to the Valentinian school of Gnosticism. In his system he appears to have regarded the divine nature as a vast abyss in whose pleroma were aeons of different orders and degrees, emanations from the source of being. Midway between the supreme God and the material world was the Demiourgos, who created the latter, and under whose jurisdiction the lower… (More on Heracleon)