Theotokos
Third Ecumenical Council
### Third Ecumenical Council

The use of *Theotokos* was formally affirmed at the [Third Ecumenical Council](/wiki/Third_Ecumenical_Council "Third Ecumenical Council") held at [Ephesus](/wiki/Ephesus "Ephesus") in 431\. It proclaimed that Mary truly became the Mother of God by the human conception of the Son of God in her womb:

The competing view, advocated by [Patriarch](/wiki/Ecumenical_Patriarch_of_Constantinople "Ecumenical Patriarch of Constantinople") [Nestorius](/wiki/Nestorius "Nestorius") of Constantinople, was that Mary should be called *Christotokos*, meaning "Birth\-giver of Christ," to restrict her role to the mother of Christ's humanity only and not his divine nature.

Nestorius' opponents, led by [Cyril of Alexandria](/wiki/Cyril_of_Alexandria "Cyril of Alexandria"), viewed this as dividing Jesus into two distinct persons, the human who was Son of Mary, and the divine who was not. To them, this was unacceptable since by destroying the perfect union of the divine and human natures in Christ, it sabotaged the fullness of the Incarnation and, by extension, the salvation of humanity. The council accepted Cyril's reasoning, affirmed the title *Theotokos* for Mary, and [anathematized](/wiki/Anathema "Anathema") Nestorius' view as [heresy](/wiki/Heresy "Heresy"). (See [Nestorianism](/wiki/Nestorianism "Nestorianism"))

In letters to Nestorius which were afterwards included among the council documents, Cyril explained his doctrine. He noted that "the holy fathers... have ventured to call the holy Virgin *Theotokos*, not as though the nature of the [Word](/wiki/Logos_%28Christianity%29 "Logos (Christianity)") or his divinity received the beginning of their existence from the holy Virgin, but because from her was born his holy body, rationally endowed with a soul, with which the Word was united according to the [hypostasis](/wiki/Hypostasis_%28religion%29 "Hypostasis (religion)"), and is said to have been begotten according to the flesh" (Cyril's second letter to Nestorius).

Explaining his rejection of Nestorius' preferred title for Mary (*Christotokos*), Cyril wrote:

> Confessing the Word to be united with the flesh according to the hypostasis, we worship one Son and Lord, Jesus Christ. We do not divide him into parts and separate man and God as though they were united with each other \[only] through a unity of dignity and authority... nor do we name separately Christ the Word from God, and in similar fashion, separately, another Christ from the woman, but we know only one Christ, the Word from God the Father with his own flesh... But we do not say that the Word from God dwelt as in an ordinary human born of the holy virgin... we understand that, when he became flesh, not in the same way as he is said to dwell among the saints do we distinguish the manner of the indwelling; but he was united by nature and not turned into flesh... There is, then, one Christ and Son and Lord, not with the sort of conjunction that a human being might have with God as in a unity of dignity or authority; for equality of honor does not unite natures. For Peter and John were equal to each other in honor, both of them being apostles and holy disciples, but the two were not one. Nor do we understand the manner of conjunction to be one of juxtaposition, for this is insufficient in regard to natural union.... Rather we reject the term 'conjunction' as being inadequate to express the union... \[T]he holy virgin gave birth in the flesh to God united with the flesh according to hypostasis, for that reason we call her *Theotokos*... If anyone does not confess that Emmanuel is, in truth, God, and therefore that the holy virgin is *Theotokos* (for she bore in a fleshly manner the Word from God become flesh), let him be anathema. (Cyril's third letter to Nestorius)


What is the meaning of hypostasis in this context?