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After this, they convened a sixth council in the city of Chalcedon. When the emperor died, Marcian succeeded him, whereupon bishops from every land gathered before him and related the injustice and lack of fairness that had marred the previous council, as well as the way in which the doctrine of Eutyches had prevailed among the people and corrupted the Christian religion. The emperor therefore ordered that all (1) the patriarchs, metropolitans, and bishops be summoned to Chalcedon. Six hundred and thirty bishops assembled there and examined the teaching of Eutyches and of the Patriarch of Alexandria, who had cut off all the other patriarchs; the whole council rejected their doctrine and anathematized them.

They affirmed that Jesus is both God and man—occupying the divine station with God in respect of his divinity, and present with us in respect of his humanity—known by two natures, complete in divinity (2) and complete in humanity, yet one Christ. They also ratified the statements of the three hundred and eighteen (3) bishops and accepted their declaration that the Son is with God in His station, Light from Light, true God (from true God, recognised as possessing two natures, complete in divinity and complete in humanity) (4); and they pronounced an anathema upon Arius.

They declared that the Holy Spirit is God, and that the Father, the Son, and the Holy Spirit are one in a single nature and three hypostases, and they reaffirmed the decision of the third council in the city