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• Theodoret of Cyr
  • drafted Formula of Union, 433​
  • Forced to condemn Nestorius
• Cyril of Alexandria
  • first to denounce Nestorius
  • proponent of hypostaticunion and Word-flesh Christology
  • Trinitarian
  • wrote Bible commentaries
• Leo the Great, pope, 400–461
  • Dogmatic Letter condemning Eutychianism addressed to Flavian, bishop of Constantinople
  • pulpit orator
  • dissuaded Attila the Hun from invading Italy in 452
  • In tome of Leo, condemned Eutychianism and formulated foundational arguments for Chalcedonian debates
• John of Antioch
• Flavian of Constantinople (had been deposed at the Robber Council)
• The papal legates who presided at the council:
  • Paschasinus, bishop of Lilybaeum
  • Bishop Lucentius
  • The priest Boniface
• Dioscurus of Alexandria deposed for role at so-called Robber Council of Ephesus
• Eusebuius of Dorylaeum
• Emperor Marciana and the Empress Pulcheria.​

Council of Chalcedon (1st: 381), 4th ecumenical council