| Guides to the Eucharist in Medieval Egypt : Three Arabic Commentaries on the Coptic Liturgy Mikhail Arsenius : Arsenius Mikhail is Professor of Liturgical Studies at St. Athanasius and St. Cyril Theological School in Los Angeles. He is the author of The Presentation of the Lamb: The Prothesis and Preparatory Rites of the Coptic Liturgy .ibn Sabbā' Yūḥannā : Yūḥannā ibn Sabbā' (13-14th centuries) was the compiler of the Coptic theological encyclopedia The Precious Jewel on the Ecclesiastical Sciences Abū al-Barakāt ibn Kabar (d. 1324) was a Coptic priest and theologian and the author of The Lamp of Darkness and the Elucidation of the Service ( Mișbâḥ al-ẓulmah wa-îḍāḥ al-khidmah ). Yūḥannā ibn Sabbā' (Author) |