Council of Ephesus (431)

A crisis born in the preaching of Constantinople

Nestorius became Patriarch of Constantinople on 10 April 428. A monk formed in the Antiochene theological climate, a vigorous preacher, he arrived in a capital where quarrels over Christological vocabulary were not specialists' questions: they touched prayer, the liturgy and the way Mary was named in popular devotion.^[1]

The contested term is Theotokos, literally "she who bears God". Nestorius feared that this title might suggest that the divinity of the Word had begun in Mary's womb, or that the divine nature could suffer and be born in time. He preferred formulas such as Christotokos, "she who bears Christ", or asked that language be more strictly divided between what belongs to God and what belongs to the man Jesus.^[2]

This apparent caution raised a more serious problem than the one it sought to avoid. If Mary is the mother only of the man Jesus, and not of the person of the Word incarnate according to his humanity, then Christ seems to become the association of two subjects: a man honoured by God on the one hand, the eternal Word on the other. The debate therefore concerns the most concrete question of the Incarnation: who is born, suffers and saves?

Cyril of Alexandria sees the doctrinal danger

Saint Cyril of Alexandria, Patriarch of Alexandria since 412, understood the controversy in the line of Nicaea. The Council of Nicaea I had confessed that the Son is true God, consubstantial with the Father; Ephesus must now say that this same Son, and no other human subject beside him, truly became man.^[3]

Cyril wrote several letters to Nestorius. The second letter, received by the council as being in conformity with Nicaea, sets out the central thesis: the Word did not unite himself to an already constituted man as to an external companion; he united to himself a flesh animated by a rational soul, so that there is one Christ and one Son.^[4]

"We do not say that the nature of the Word was changed into flesh, nor that it was transformed into a complete man, composed of soul and body; we say that the Word, having personally united to himself a flesh animated by a rational soul, became man in an ineffable and inconceivable manner." — Saint Cyril of Alexandria, second letter to Nestorius, received at Ephesus^[5]

This sentence gives the key to the council. Cyril does not confuse divinity and humanity; he refuses to separate them into two persons. He holds two requirements together: the Word remains what he is, immutable God; and he truly assumes our humanity, to the point that what happens to his flesh can be attributed to the incarnate Word.

In simple words, "to unite according to the hypostasis" means: the Word does not join himself from the outside to a man who is already there, like two partners walking side by side; it is the Word himself who makes this humanity his own, so that there is only one person, one subject: Jesus Christ.

Rome intervenes before the council

The controversy did not remain an Egypto-Constantinopolitan affair. Both sides sought the support of Rome. Pope Celestine I gathered a synod at Rome on 11 August 430, condemned the doctrine of Nestorius and entrusted Cyril with carrying out the sentence if Nestorius did not retract.^[6]

Cyril then gathered a synod at Alexandria and sent Nestorius a third letter, accompanied by twelve anathemas. These texts would be read in the acts of Ephesus. They are sharper than the second letter and target the possible doctrinal loopholes: division of the Gospel expressions, separate worship, refusal to attribute to the Word the sufferings undergone in the flesh.^[7]

Ephesus, a biblical and Marian city

The council met at Ephesus, a great city of Asia Minor associated with Saint Paul, the Johannine tradition and the memory of Mary. The traditional venue of the sessions is the Church of Mary, a large early-Christian monument whose ruins are still visible in the archaeological site of Ephesus.^[8]

The choice of the city carries symbolic weight. Ephesus was one of the places where the Christian memory of Mary was strong; but the council did not define a doctrine through mere popular pressure. The sources show an assembly structured around precise texts: the Nicene symbol, Cyril's letters, Celestine's letter, Nestorius's declarations and the procedural acts.^[9]

A tightly framed imperial convocation

Emperor Theodosius II, with his co-emperor Valentinian III and with the agreement of Pope Celestine I, asked the bishops convened to be present at Ephesus on 7 June 431, the feast of Pentecost. The official intention was to resolve a public crisis threatening the unity of the Church and the Empire.^[10]

The late arrival of the delegations immediately created a difficulty. Cyril arrived with the Egyptian bishops; Nestorius was present with a smaller group; John of Antioch and the Syrian bishops were delayed; the Roman legates had not yet arrived. On 22 June, after several days of waiting, Cyril opened the first session. Nestorius was cited three times and refused to appear under these conditions.^[11]

This opening before the arrival of the Easterners would become one of the grievances of the Antiochene party. But the acts of the session show that the council did not judge a mere absence: it read the doctrinal documents, compared the letters with the faith of Nicaea, and pronounced the deposition of Nestorius as a consequence of his doctrine.^[12]

The number of bishops

The figures vary according to the sources and the moments of the proceedings. The first sentence against Nestorius received 197 immediate signatures according to the introduction published by Catholic Culture; Fourth Century Christianity gives an overall range of 150 to 200 participants for the assembly.^[13] The exact figure matters less than the real structure: a Cyrillian majority met first; John's Easterners of Antioch then held a separate assembly; the Roman legates joined Cyril and confirmed the sentence.

Nestorius, Patriarch of Constantinople

Nestorius is the direct adversary of the council, but he must not be caricatured. He did not present himself as a man who denied all greatness to Christ. His stated concern was to protect divine transcendence and not to attribute birth, suffering or death to divinity as such. The problem is that his solution makes these events borne by a human subject associated with the Word rather than by the incarnate Word himself.^[14]

The fragments and replies attributed to Nestorius show that he dreaded a confusion of the natures. His defence often contrasts what befits God with what befits man. Ephesus will not reject this distinction in itself; Chalcedon will even formulate it clearly in 451. What is rejected is the division of Christ into two subjects of attribution.^[15]

Cyril of Alexandria, effective president of the assembly

Cyril effectively presided over the first assembly of Ephesus. His theological strength lies in linking divine motherhood, the hypostatic union and salvation. If the body of Christ is not the Word's own body, then the Eucharist, the cross and the resurrection lose their immediate salvific scope. The eleventh anathema insists precisely on the life-giving flesh of the Lord: it gives life because it belongs to the Word who gives life to all.^[16]

The Cyrillian formula may seem bold: "the Word suffered in the flesh". It does not mean that the divine nature becomes passible. It means that the subject who suffers in his humanity is the incarnate Word. The distinction between nature and person is decisive here.

John of Antioch and the Eastern party

John of Antioch arrived after the opening of the council. He judged the procedure irregular, gathered the Eastern bishops of his party and pronounced a competing sentence against Cyril and Memnon of Ephesus. The emperor thus received two opposing accounts: a council deposing Nestorius, and a counter-synod accusing Cyril of having acted precipitately.^[17]

This fracture must not be read merely as a clash of personalities. It reflects two theological sensibilities: Alexandria insists on the unity of the incarnate subject; Antioch fears that unity will make the full humanity of Christ disappear. The peace of 433 would seek precisely to keep both requirements: one Christ, acknowledged in two natures without confusion.

The Roman legates

The legates of Pope Celestine, Bishops Arcadius and Projectus and the priest Philip, arrived after the first sentence. They asked that the pope's letter be read, then joined in the judgment against Nestorius. The acts report that the Roman letter was read in Latin and then translated into Greek, which shows the weight but also the practical necessity of reception by the Eastern assembly.^[18]

The formula of the priest Philip, often cited in discussions on Roman primacy, situates Rome's intervention within the ancient consciousness of the see of Peter. This article need not make it the centre: the dogmatic point of Ephesus remains Christology. But historically, the council shows a collaboration between a prior Roman decision and Eastern synodal reception.

Mary Theotokos: a Christological definition

The first anathema of Cyril gives the decisive sentence:

"If anyone does not confess that the Emmanuel is truly God, and that for this reason the Holy Virgin is Theotokos, since she bore according to the flesh the Word of God made flesh [as it is written: the Word was made flesh], let him be anathema." — Saint Cyril of Alexandria, first of the twelve anathemas received at Ephesus^[19]

The logic is rigorous. Mary is called Mother of God not because she would be the source of divinity, but because her son is God the incarnate Son. A mother does not bear an abstract nature; she bears a person. And the person born of Mary according to humanity is the eternal Word.

This definition corrects two symmetrical errors. It first rejects Nestorianism, which separates the Word and the man Jesus too much. It also rejects any Monophysite confusion before its time: Cyril does not say that divinity is transformed into flesh, but that the Word assumes a true humanity.

One person, not two associated sons

The second anathema specifies that the Word is united to the flesh according to the hypostasis. The vocabulary would be stabilised later, but the idea is already clear: the union is not a mere dignity, a common power or a moral indwelling.^[20]

The third anathema targets those who divide the hypostases after the union and acknowledge only an association according to honour or authority. The fourth targets the artificial distribution of the biblical words: the words of greatness would be given to the Word alone, the words of abasement to the separated man. Ephesus requires reading the Gospel differently: the one who sleeps in the boat, weeps, suffers and dies is the same Son who forgives, rises and receives worship.^[21]

This table shows why the controversy is not a quarrel over words. The whole sacramental and soteriological faith is at stake. If Christ is two subjects, salvation is mediated by an association; if he is one incarnate Son, God himself assumes our condition to unite us to him.

Fidelity to Nicaea

Ephesus presents itself as a council of fidelity to Nicaea. The Fathers did not wish to produce a new competing faith, but to judge new formulations in the light of the symbol received in 325.^[22]

The sixth session affirms that no one is permitted to produce or write another faith than the one defined by the holy Fathers gathered at Nicaea. This rule has often been discussed in the history of the Creed, notably concerning the development of the Constantinopolitan symbol and, later, the Filioque. In its immediate context, it means above all: the Nicene confession is not to be replaced by a Christology that changes the meaning of the Incarnation.

"No one is permitted to produce, write or compose another faith, rival to that defined by the holy Fathers assembled with the Holy Spirit at Nicaea." — Council of Ephesus, decree of the sixth session on the faith of Nicaea^[23]

The deposition of Nestorius

The first visible decision is the deposition of Nestorius. After the summonses went unheeded and his writings were examined, the sentence declares him excluded from episcopal dignity and from all priestly communion.^[24]

The vocabulary is severe, but it matches the nature of the crisis: Nestorius is condemned not for an isolated clumsiness, but because his public teaching on Christ was judged incompatible with the faith of Nicaea. His deposition would be confirmed in the final reception; he first withdrew to his former monastery near Antioch, then was exiled more definitively in the following years.^[25]

The twelve anathemas

Cyril's twelve anathemas are read in the acts. Their exact historical status has been debated, but they belong to the dogmatic dossier of Ephesus and have been received in Catholic tradition as a strong expression of Cyrillian Christology.^[26]

They cover the following points:

The eleventh and twelfth anathemas show the link between Christology and salvation. It is not enough to say that Jesus is close to God; one must be able to say that his flesh is life-giving because it is the own flesh of the Word, and that the Word tasted death in this flesh.

The decree on Cyprus and the autonomy of the Churches

The council also dealt with an important disciplinary matter: the autonomy of the Church of Cyprus against the claims of the see of Antioch. The decree forbids a bishop from seizing a province that was not previously under his jurisdiction.^[27]

This point is often forgotten, but it is valuable for understanding ancient ecclesiology. Ephesus does not settle only a dogma; it also protects local canonical usages against the expansion of a great see. The principle is conservative in the good sense of the term: not altering through ambition what comes from an ancient and recognised possession.

The Messalians

The acts also include a definition against the Messalians or Euchites, an ascetic movement accused of exalting prayer to the detriment of sacramental and ecclesial life. This secondary decision recalls that ecumenical councils often combine several dossiers: the heart of Ephesus is Christological, but the assembly also responds to the doctrinal and disciplinary disorders brought before it.^[28]

The canons against the partisans of Nestorius and of Celestius

The seventh session promulgates disciplinary canons naming both errors together. The Easterners who refuse to join the decree against Nestorius are deposed, their refusal manifesting their attachment to the opinions of Nestorius and Celestius; canons 1 to 5 strike metropolitans, bishops and clerics who join the apostasy, adopt the doctrines of Celestius or reinstate the condemned, while canon 6 deposes or excommunicates anyone who claims to annul the decisions of Ephesus.^[29]

The acts further confirm the condemnation of the Pelagians already pronounced: after the reading of the documents touching the deposition of Celestius, Pelagius, Julian and their partisans, the synod holds firm and valid the decisions of Celestine concerning them and holds them all deposed.^[30]

The see of Constantinople, left vacant by the deposition of Nestorius, was filled as early as 25 October 431 by the ordination of Maximian, and the decrees of the council would be approved by Sixtus III shortly after his own ordination on 31 July 432.^[31]

An initially conflictual reception

The reception of Ephesus was at first chaotic. John of Antioch and his bishops rejected Cyril's procedure; imperial power hesitated; both camps sent memoranda and representatives to Constantinople. The Catholic Encyclopedia even reports the episode of a letter hidden in a hollow cane, carried by a messenger disguised as a beggar, to describe the distress of the bishops detained at Ephesus.^[32]

This tension explains the emperor's caution. It is not enough for a text to be true for its ecclesial reception to be immediately peaceful. Dogmatic truth still had to be received by real Churches, with their rivalries of sees, their theological sensibilities and their political wounds.

Rome and Alexandria confirm the conciliar line

Pope Celestine died on 26 July 432 (feast on 27 July).^[33] His successor Sixtus III confirmed the reception of the council. Cyril returned to Alexandria on 30 October 431, welcomed with joy, and became in ecclesial memory the great doctor of the Incarnation.^[34]

The Roman reception does not make Ephesus a mere administrative act from Rome. It means that the condemnation of Nestorius, the judgment of the assembly and the faith confessed belong within Catholic communion. The council thus became one of the shared landmarks of Catholic and Orthodox faith.

The formula of reunion of 433

Peace with Antioch came in 433. John of Antioch sent a profession of faith which Cyril accepted. This formula of reunion confesses one Christ, Son, Lord and Only-begotten, known in two natures, and acknowledges Mary as Theotokos because the Word became incarnate and was made man.^[35]

This text is crucial because it prevents a one-sided reading of Ephesus. The unity of Christ does not absorb his humanity; the distinction of the natures does not divide the person. Chalcedon in 451 would build on this reception by receiving Cyril's letters to Nestorius and to the Easterners as documents fit to interpret the symbol of faith.^[36]

"We confess, then, our Lord Jesus Christ, the only begotten Son of God, perfect God and perfect man, of a rational soul and a body [...]" — Formula of reunion of 433, profession of faith of John of Antioch received by Cyril^[37]

The heart of Catholic Mariology

Ephesus gives Mariology its proper axis. Mary is not honoured beside Christ as a competing greatness; she is called Mother of God because Christ is God made man. Marian dogma therefore depends on Christology. When Catholic piety invokes Mary as Mother of God, it confesses at the same time the Incarnation of the Son.

This logic answers the classic objection: "Mother of God" does not mean that Mary would be before God, nor that she would be the cause of divinity. The title says that the child born of her is a divine person. That is precisely the distinction between the eternal origin of the Son in the Father and the temporal birth of the Son according to humanity.

A rule for reading the Gospel

Ephesus requires reading the Gospels with the unity of the subject. The words of abasement and the words of glory are not distributed between two Christs. The same Jesus is the one who hungers and the one who feeds the crowds; the one who sleeps and the one who commands the sea; the one who dies and the one who rises.

This unity is also the basis of the liturgy. The Church worships the crucified Christ because the crucified one is the Lord of glory in his flesh. She receives the Eucharist as life-giving flesh because it is the flesh of the incarnate Word. She prays to Mary as Mother of God because Mary's motherhood concerns the person of the Son, not an isolated humanity.

A bridge to Chalcedon

Ephesus does not say everything Chalcedon would say twenty years later. It defines above all against the Nestorian division. Chalcedon would also have to answer other imbalances by confessing Christ "acknowledged in two natures, without confusion, without change, without division, without separation".^[38]

But Chalcedon does not replace Ephesus. It receives it. The proper Catholic balance holds the two councils together: Ephesus protects personal unity; Chalcedon simultaneously protects unity of person and distinction of natures.

• Mary Mother of God (431) — doctrinal article on the title Theotokos.
• Council of Nicaea I (325) — the symbol to which Ephesus refers.
• Council of Constantinople I (381) — development of the Nicene Creed.
• The 4 Marian dogmas — synthesis of the Marian definitions.
• The divinity of Jesus — Christological foundation of the title Mother of God.