The moment
Called by Emperor Theodosius II, the council was run by Cyril of Alexandria, who had Nestorius, bishop of Constantinople, deposed for refusing to call Mary Theotokos, 'God-bearer'. Bishops from Antioch arrived late, held a rival synod and deposed Cyril in turn; a compromise formula reunited the two sides in 433. The Church of the East in Persia never accepted the verdict and went its own way.
People: Cyril of Alexandria, Nestorius, Theodosius II