Explore the Historical Timeline

THE SEVEN ECUMENICAL COUNCILS

Explore the foundational, historical timeline defining Orthodox Doctrine.

325 AD
Council I
381 AD
Council II
431 AD
Council III
451 AD
Council IV
553 AD
Council V
680-681 AD
Council VI
787 AD
Council VII

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."

[Historical Illustration Canvas Area]
✦ 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.