Isaac the Syrian (Syriac: ܡܪܝ ܐܝܣܚܩ ܕܢܝܢܘܐ; Arabic: إسحاق النينوي Ishaq an-Naynuwī; Greek: Ἰσαὰκ Σῦρος; c. 613 – c. 700), also remembered as Saint Isaac the Syrian, Isaac of Nineveh, Abba Isaac, Isaac Syrus and Isaac of Qatar, was a 7th-century Syriac Christian bishop and theologian best remembered for his written works on Christian asceticism. He is regarded as a saint in the Church of the East and in the Eastern Catholic, Oriental Orthodox and Eastern Orthodox traditions. His feast day falls, together with 4th-century theologian and hymnographer St. Ephrem the Syrian, on January 28.
