Isaac of Nineveh

Isaac of Nineveh (Arabic: إسحاق النينوي Ishak an-Naynuwī; Greek: Ἰσαὰκ Σύρος; c. 613 – c. 700) also remembered as Saint Isaac the Syrian, 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 also regarded as a saint in the (non-Ephesine) Church of the East, the Orthodox Church, and among the (non-Chalcedonian) Oriental Churches, making him the last saint chronologically to be recognised by every apostolic Church of the Christian East. His feast day falls, together with 4th-century theologian and hymnographer St. Ephrem the Syrian, on January 28.