Pope Leo I
The Syro-Malabar Catholic Church recognises Ambrose, Jerome, Gregory, Augustine, Athanasius, Basil, Gregory of Nazianzus and John Chrysostom, as well as Ephrem the Syrian, Isaac the Elder, Pope Leo I, John of Damascus, Cyril of Alexandria, Cyril of Jerusalem, Epiphanius of Salamis and Gregory of Nyssa.