Isaac of Nineveh also remembered as Saint Isaac the Syrian, Abba Isaac, Isaac Syrus and Isaac of Qatar was a 7th-century Church of the East Syriac Christian bishop and theologian best remembered for his written works on Christian asceticism. He is regarded as a saint in the (non-Ephesine) Assyrian Church of the East. In the Eastern Orthodox tradition, his feast day falls, together with 4th-century theologian and hymnographer St. Ephrem the Syrian, on January 28.
