Visiting Bishop (student of the School in Antioch) gives a sermon (in the presence of Nestorius) cautioning the use of the word Theotokos.
The people of Antioch write to St Cyril, Bishop of Alexandria.
In those days, Alexandria has primacy in the East...
There are conflicts & rivalry with Constantinople
Alexandria deposed patriarch of Constantinople 7 times (Athanasius: 3 times?, Timothy deposed Macedonius, Theophilus deposed St John Chrysostom, Cyril deposes Nestorius, Dioscorus will depose Flavian
Cyril is very charitable, giving the benefit of the doubt
He continues to go that way - even after making conclusions about Nestorius' heresy, he will continue to call him "Most Holy" and "Blessed" and "Minister of Christ" etc. because he is not deposed
Greeting, complaint against the priest delivering the letter, then...
"As far as we are concerned, although your reverence has done many things not in keeping with brotherly love (to put it gently), we write this salutation with patience and love."