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451
Anno Domini

Ecumenical Council

Council of Chalcedon

October–November 451 Chalcedon, Bithynia Convoked by: Emperor Marcian 600 bishops 30 canons
Ecumenical Council — Universally Recognised
30Canons
Section I

The Crisis that summoned Council of Chalcedon

The apologetic argument: Defined the two natures of Christ (fully human, fully divine in one person) using Leo's Tome as the theological definition. Eastern bishops acclaimed: "Peter has spoken through Leo!" — the most explicit patristic confirmation of Roman teaching authority in history.
The Ecumenical Councils

The Seven Ecumenical Councils

325
Council of Nicaea
ecumenical
325
Council of Nicaea I
ecumenical
343
Council of Sardica
regional
381
First Council of Constantinople
ecumenical
381
Council of Constantinople I
ecumenical
397
Council of Carthage (AD 397)
regional
431
Council of Ephesus
ecumenical
431
Council of Ephesus
ecumenical
451
Council of Chalcedon
ecumenical
529
Council of Orange II
regional

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