Pillar of the Faith -- honored in Coptic Church -- 24th Patriarch of the See of Saint Mark

 Cyril I of Alexandria - African theologian and church leader - preacher - exegete

Church Orthodox defender -- controversies with Arians, Novatianists, 

also engaged in lethal combat with Neo-Platonists based at Library of Alexandria

(then led by philosopher Hypatia); he was also antagonistic with Jewish community

at Alexandria, eventually evicting and banishing those with whom he engaged in controversies

He also extremely engaged in debate and opposition to St. John Chrysostom of Antioch and

Bishop Nestorius of Constantinople

This "Doctor of the Church" died June 27, 444

https://dacb.org/stories/egypt/cyril-alexandria2/