Ephesus
When and where
    431 AD in Ephesus
Crisis or controversy
    Nestorius was teaching that Mary was
not the mother of God;
    Proponents of Nestorius began claiming
that Christ was actually two separate
persons, human and divine.
Attendees
    250 bishops;
    Convened: Theodosius II, Emperor;
    St. Cyril of Alexandria;
    St. John Chrysostom;
    Ratified: Celestinus I, Pope.
Decrees and resolutions
    Condemned Nestorius;
    Decreed that Mary was also Theotokos, mother of God;
    Declared that Christ is true God and true man, that he has two
      natures (human and divine) joined in one person.
Basilica of St. John at Ephesus