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Our father among the [[saint]]s '''Cyril of Alexandria''' was the [[Pope]] of Alexandria at the time Alexandria was at its height in influence and power within the Roman Empire. Cyril wrote extensively and was a leading protagonist in the [[Christology|Christological]] controversies of the 4th and 5th centuries. He was a central figure in the [[Third Ecumenical Council|Council of Ephesus]] in 431 which led to the deposition of [[Nestorius]] as Archbishop of Constantinople. Cyril is among the patristic fathers, and his reputation within the Orthodox Christian world has led to his acquiring the title "Seal of all the Fathers." His [[feast day]] is celebrated on [[June 9]] and, with St. [[Athanasius of Alexandria]], on [[January 18]].