Explore the Historical Timeline

THE SEVEN ECUMENICAL COUNCILS

Explore the foundational, historical timeline defining Orthodox Doctrine.

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325 AD

381 AD

431 AD

451 AD

553 AD

680-681 AD

787 AD

Council IV: Chalcedon

451 AD — St. Leo the Great and Eutyches

"The Council of Chalcedon defined the two natures of Christ—divine and human—manifested in one single hypostasis, undivided and unconfused, firmly settling the foundational Christological declarations against heretical claims."

Ecumenical Council Historical Center Canvas

✦ Key Figures Involved

St. Leo and Dioscorus, Eutyches and Marcian.

✦ Central Theological Issue

Monophysitism vs. Hypostatic Union definitions.

✦ Historical Outcome

The Tome of Leo accepted; adoption of the Chalcedonian Definition.