is called a most learned writer. He lived about A. D. 132, in the reign of the emperor Hadrian, and wrote a very accurate refutation of the heresies of Basilides the Gnostic and his son Isidorus. A fragment of this work is preserved in Eusebius. (Hist. Eccles. 4.7; comp. Hieron. Script. Eccles. 21, Indic. Haeres. 2; Theodoret, De Haeret. Fab. 1.4.)