3 surviving letters between Cyril of Alexandria and Nestorius, spanning 430 AD.
“To the most religious and beloved of God, fellow minister Nestorius, Cyril sends greeting in the Lord.”
“To the most reverend and God-loving fellow-minister Nestorius, Cyril and the synod assembled in Alexandria, of the Egypt…”
“This letter (Cyril's third to Nestorius) is referenced in the Council of Ephesus acts but its full text overlaps substan…”