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Isḥaq of Nineveh ( Syriac : ܡܪܝ ܐܝܣܚܩ ܕܢܝܢܘܐ , romanized : mār isḥāq d-ninwē ; Arabic : إسحاق النينوي Ishaq an-Naynuwī ; c. 613 – c. 700), also remembered as Saint Isaac the Syrian ( Ancient Greek : Ἰσαὰκ ὁ Σύρος ), Isaac of Nineveh , Abba Isaac , Isaac Syrus and Isaac of Qatar , was a 7th-century Syriac Christian bishop of the Church of the East , and theologian best remembered for his written works on Christian asceticism . He is regarded as a saint in the Church of the East , Roman Catholic , Eastern Orthodox and Syriac Orthodox [ note 1 ] churches. His feast day falls, together with 4th-century theologian and hymnographer St. Ephrem the Syrian , on January 28. In the Syriac Orthodox Church , his feast day falls on May 14.