DIDYMUS , surnamed "the Blind," ecclesiastical writer of Alexandria, was, in spite of becoming blind at the age of four, one of the most learned men of his day, respected by Jerome and Athanasius. He became head of the catechetical school of Alexandria. He was condemned by the sixth and seventh general councils as a continuator of Origen, but he stoutly opposed Arian and Macedonian teaching. His surviving writings show a remarkable knowledge of Scripture, and have distinct value as theological literature. They include the De Trinitate, De Spiritu Sancto (Jerome's Latin trans.), Adversus Manichaeos, and ex positions of various books, especially the Psalms and the Catholic Epistles.
See Migne, Patrol. Graec. xxxix.; J. Leipoldt, "Didymus der Blinde" in Texte u. Untersuchungen zur Gesch. der altchrist. Lit., vol. xiv. (Leipzig, 1906) ; Tixeront, Hist. of Dogma, vol. ii. (1914) •