Origen of Alexandria Origen of Alexandria, Christian theologian Ὠριγένης Ἀδαμάντιος · Origenes Adamantius Dates 185–254 (approx.) Works (4) Origen. (ANF) Epistle to Gregory and Origen's Commentary on the Gospel of John. (ANF) Origen Against Celsus. (ANF) Origen's Commentary on the Gospel of Matthew. (ANF)