Council of Chalcedon, Fourth Ecumenical Council (AD 451)
| Date | October and November, 451 |
| Location | Chalcedon |
| Number of Participants | 520 |
| Summoned by | Emperor Marcian of the Byzantine Empire |
| Chaired by | Anatolius, Patriarch of Constantinople |
| Key Participants | Pope Leo I (by proxy), Dioscorus of Alexandria, Anatolius of Constantinople |
| Purpose | To define orthodox catholic doctrine in opposition to monophysite heresy and to enact church discipline. |
| Key Events | The reading of and subscription to Leo’s Tome; deposition of Dioscorus; exile of Eutyches; Canonization of Flavian |
Surviving Documents:
The full proceedings of the council can be found in the Acta Conciliorum Oecumenicorum; our index for the proceedings can be found here.
Bibliography:
Created by SCD
Last updated: 2-11-2025 by JSW
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