An Exact Exposition of the Orthodox Faith

A polymath whose fields of interest and contribution included law, theology, philosophy, and music, before being ordained, he served as a Chief Administrator to the Muslim caliph of Damascus, wrote works expounding the Christian faith, and composed hymns which are still in everyday use in Eastern Christian monasteries throughout the world. The Catholic Church regards him as a Doctor of the Church, often referred to as the Doctor of the Assumption due to his writings on the Assumption of Mary.