(ST.), bishop of ROME, A. D. 109-119. (Euseb. Hist. Eccl. 4.4.) There are three Epistles falsely ascribed to him by Isidore Mercator, as well as a decree, according to Gratian. (Mansi, Concilia. vol. i. pp. 643-647.) Heracleon is said (in the book Pracdestinatus, ap. Sirmond. Opp. vol. i. p. 470) to have broached his heresy in Sicily in the time of St. Alexander, and to have been confuted by him. But Heracleon was not, perhaps, yet born.