c.640-724. Prominent Monophysite* church writer. After 676 he was chief bishop of Arab tribes in the Tigris and Euphrates area that were still Christian. Among his writings and works were a translation of Aristotle's Organon into Syriac, rhymed treatises on the sacraments, and treatments of patristic, dogmatic, exegetical, and astronomical questions in tracts and letters. He also completed the Hexameron begun by .