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Who was Cyril of Alexandria and what was his impact?

Cyril of Alexandria was an influential Egyptian Christian theologian and Patriarch from 412 to 444 who played a major role in Christological controversies. He presided over the Council of Ephesus in 431, which clarified the hypostatic union of Christ's natures and defended the title Theotokos for the Virgin Mary. Venerated as a saint and Doctor of the Church, his tenure was also marked by intense political friction, including a severe feud with the Roman prefect Orestes.

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