Heracleon was a Gnostic thinker active in the second century (but more probably its second half, and not the first, as the Praedestinatus claims making him the contemporary of Alexander). He is mentioned in connection with Valentinus by Clement of Alexandria, Origen, and Hippolytus of Rome (Refutation of all heresies). Hippolytus links him with Italy so the claim of Praedestinatus that Heracleon was active in Sicily is not in itself improbable. Augustine in De haeresibus - the work which was a template for Book 1 of Praedestinatus - also names Heracleonites in chapter 16 but he does not give any historical information about them. He only says that they are said to "so to speak redeem anew their dying, that is by oil, balm and water and invocations which they said in Hebrew above their heads." The opinions about baptism Arnobius ascribes to them are not attested elsewhere. We do not know from where Arnobius took his information about Heracleon and Heracleonites but it is not very probable that it has historical value.