 He died in Armenia in A.D. 912.Translations of Diophantos, Theodosius of Bithynia's "Sphaerica", "On Days and Nights (Περὶ ἡμερῶν καὶ νυκτῶν -De diebus et noctibus)", "On the places of habitation" ("Περὶ οἰκήσεων - De habitationibus"), Autolycus' "On the moving sphere" ("Περὶ κινουμένης σφαίρας" - "De sphaera quae movetur), On Risings and Settings" ("Περὶ ἐπιτολῶν καὶ δύσεων" - "De ortibus et occasibus"), Hypsicles' "On Ascensions" ("Ἀναφορικός"), Aristarchus, Theophrastus’ Meteora, Galen’s catalogue of his books, Hero of Alexandria's (Heron's) Mechanics, and John Philoponus were made or revised by him, or made under his direction.He wrote commentaries on Euclid and a treatise on the Armillary sphere.