Henotikon

In 451, the Council of Chalcedon settled christological disputes by condemning both Monophysitism, held by Eutyches, and Nestorianism. However, large sections of the Eastern Roman Empire, especially in Egypt, but also in Palestine and Syria, held miaphysite views. In order to restore unity, the Patriarch of Constantinople, Acacius, devised an eirenic formula, which Emperor Zeno promulgated without the approval of a synod of bishops. The Henotikon endorsed the condemnations of Eutyches and Nestorius made at Chalcedon and explicitly approved the twelve anathemas of Cyril of Alexandria, but avoided any definitive statement on whether Christ had one or two natures, attempting to appease both sides of the dispute.

This act failed to satisfy either side. All sides took offence at the Emperor openly dictating church doctrine, although the Patriarch of Antioch was pressured into subscribing to the Henotikon. When Patriarch John I of Alexandria refused, the Emperor had him expelled and instead recognized the Miaphysite Peter Mongos, who accepted the Henotikon. However, other miaphysites abandoned him^[who?] and were thenceforth called Akephaloi (headless ones), since they had lost their leader.^[2] After two years of prevarication and temporizing by Acacius, Pope Felix III of Rome condemned the act and excommunicated Acacius (484), although this was largely ignored in Constantinople, even after the death of Acacius in 489.

Zeno died in 491. His successor Anastasius I was sympathetic to the monophysites, and accepted the Henotikon. However, Anastasius's position was at odds with the predominantly Chalcedonian population of Constantinople, and Vitalian, a Chalcedonian general, attempted to overthrow him in 514. Anastasius then attempted to heal the schism with Pope Hormisdas, but this failed when Anastasius refused to recognize the excommunication of the now deceased Acacius. Vitalian tried to overthrow the emperor a second time, but he was defeated by loyal officers.

The schism caused by the Henotikon was officially settled in 519 when Emperor Justin I recognized the excommunication of Acacius and reunited the Chalcedonian churches. However, the then-Patriarchs of Alexandria and Antioch still embraced miaphysitism, and their churches came to be known in modern times as the Oriental Orthodox Churches. Meanwhile, the incident did nothing to mend the growing rift between the churches of Constantinople and Rome, which would lead in later centuries to the East-West Schism.

• Christology
• Hypostatic union

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• Kötter, Jan-Markus (2013). Zwischen Kaisern und Aposteln. Das Akakianische Schisma (485-519) als kirchlicher Ordnungskonflikt der Spätantike. Franz Steiner Verlag. ISBN 978-3-5151-0389-3.
• Meyendorff, John (1989). Imperial unity and Christian divisions: The Church 450-680 A.D. The Church in history. Vol. 2. Crestwood, NY: St. Vladimir's Seminary Press. ISBN 9780881410563.
• Ostrogorsky, George (1956). History of the Byzantine State. Oxford: Basil Blackwell.
• Richards, Jeffrey (1979). The Popes and the Papacy in the Early Middle Ages, 476–752. Routledge & Kegan Paul. ISBN 978-0-7100-0098-9.

• Catholic Encyclopedia: Henoticon
• Edward Walford, translator, The Ecclesiastical History of Evagrius: A History of the Church from AD 431 to AD 594, 1846. Reprinted 2008. Evolution Publishing ISBN 978-1-889758-88-6 – contains a complete English translation of the Henotikon.
• The Henoticon (Instrument of Union) (tertullian.org)