Cyril of Alexandria c. AD 375 – 444 · patriarch of Alexandria · theotokos · the foundation of Chalcedonian Christology

Alexandrian childhood and training under Theophilus

Cyril was born at Alexandria around 375 to a family of substantial standing — his mother was the sister of Theophilus, who became patriarch of Alexandria in 385 and held the see for twenty-seven years until his death in 412. The young Cyril was raised in his uncle's household and trained in the Alexandrian monastic-theological tradition that combined rigorous catechetical instruction, intensive biblical study (in the Origenist heritage, though Cyril and his uncle would later distance themselves from explicit Origenism), and the powerful institutional life of the Alexandrian patriarchate. He accompanied his uncle to the Synod of the Oak in 403 — the synod near Constantinople at which Theophilus engineered the deposition of John Chrysostom, the patriarch of Constantinople. The substantive theological and political education the young Cyril received was therefore at the highest level the early-fifth-century Eastern church could provide; the political ruthlessness he would later display had also been modelled for him in his uncle's career.

The patriarchate and the early Alexandrian conflicts (412 – 428)

Cyril succeeded his uncle as patriarch of Alexandria in 412 after a contested election. The first years of his patriarchate were marked by tensions with the Roman civil prefect Orestes and with the Alexandrian pagan and Jewish communities — tensions that produced the most morally serious incidents of Cyril's life. Around 414 — 415 the Jewish community of Alexandria was expelled (the substantive responsibility lies on Cyril's side, though the exact circumstances are contested in modern scholarship). In March 415 the pagan philosopher Hypatia — a brilliant Neoplatonist mathematician and teacher, daughter of the mathematician Theon, and an associate of the prefect Orestes — was murdered by a Christian mob led by a lector named Peter. The murder was a brutal lynching; Hypatia was killed and her body desecrated. The direct culpability of Cyril is contested in the ancient and modern sources; he probably did not order the killing, but his patriarchate's polemical climate and his factional opposition to Orestes provided the context in which it occurred. The Reformed Christian does not soften the substantive moral failure of these episodes.

From the mid-410s through the 420s Cyril produced the major exegetical work of his career — commentaries on John, Luke, Isaiah, the Pentateuch (the Glaphyra), the Minor Prophets, and other Old Testament books — and the substantive theological work that would prepare him for the Nestorian controversy of the late 420s.

The Nestorian controversy (428 – 431)

In 428 Nestorius — a monk from Antioch and a popular preacher — was elevated to the patriarchate of Constantinople. His sermons against the title theotokos ("God-bearer") for Mary, arguing that Mary bore only the human Jesus and that "God the Word" could not properly be said to have been born, suffered, or died, alarmed the Cyrilline party at Alexandria and the broader Eastern Christian world. Cyril responded with a series of escalating engagements: the First Letter to Nestorius (early 429), the Second Letter (mid-429, more substantive), the Third Letter with the Twelve Anathemas (November 430), and an extensive paschal letter to the Egyptian monks. Cyril also lobbied at the imperial court (Pulcheria the empress was already substantively pro-Cyrilline) and at Rome (Pope Celestine I produced a synodal letter at Rome in August 430 condemning Nestorius). The Emperor Theodosius II summoned the Council of Ephesus to address the controversy, which met from June 431.

The Council of Ephesus (431) and the Formula of Reunion (433)

The Council of Ephesus opened on 22 June 431, with Cyril presiding (in the place of Pope Celestine, whose legates had not yet arrived). Despite procedural irregularity (the Antiochene delegation under John of Antioch was still travelling, and the eastern bishops had not yet arrived), Cyril proceeded to the formal deposition of Nestorius that same day. The eastern bishops, arriving four days later, held a counter-synod that deposed Cyril. The Roman legates arrived in July and supported Cyril's synod. The emperor Theodosius II, faced with two opposed synods, initially imprisoned both Cyril and Nestorius; eventually he confirmed Cyril's deposition of Nestorius. Mary was confessed as theotokos; Nestorius was exiled (eventually to Upper Egypt, where he died in the 450s). The substantive theological achievement of the council was the formal confession that the eternal Word himself is the single personal subject of all that is said of Christ in the Gospels.

In 433, after extended negotiations brokered by the moderate bishops of both sides, Cyril and John of Antioch agreed on the Formula of Reunion — a careful document, drafted substantially by Theodoret of Cyrus, that confessed Christ as "perfect God and perfect man," "of one substance with the Father according to deity and of one substance with us according to humanity," "of two natures, a union without confusion having taken place." The Formula was the substantive Christological vocabulary Chalcedon would later receive. The Cyril-John reconciliation was the high-water mark of fifth-century Christological consensus; the later Cyrilline party (under Dioscorus after Cyril's death) would press the Christology in directions Cyril himself had not pressed it.

The late years and death (433 – 444)

The final eleven years of Cyril's patriarchate produced the mature Christological writings — On the Unity of Christ (a substantial dialogue, probably written in the late 430s, that is the best single introduction to Cyril's mature Christology); the Scholia on the Incarnation; the various defences of the Twelve Anathemas; the late commentary work — and the major apologetic Against Julian the Apostate (written in the late 430s or early 440s, responding to the long-dead emperor Julian's Against the Galileans, c. 363). Cyril died on 27 June 444 at age sixty-nine; his nephew Dioscorus succeeded him as patriarch of Alexandria and would press the Cyrilline Christology in directions Cyril himself had not pressed it, leading to the Eutychian crisis and eventually to Chalcedon.

On the Unity of Christ (c. 435 – 440)

On the Unity of Christ is the best single introduction to Cyril's mature Christology. The work is in dialogue form — Cyril (the speaker named "A") in conversation with a generic interlocutor — and articulates the doctrine that the eternal Word himself is the single subject of all that is narrated in the Gospels: the Word himself was born of Mary, the Word himself grew in wisdom, the Word himself suffered (in the flesh, impassibly), the Word himself died, the Word himself rose. The work is theologically substantive, biblically grounded, and pastorally framed; it is the right place to encounter Cyril at the mature articulation of his Christology. John A. McGuckin's translation in the Popular Patristics Series (St Vladimir's Seminary Press, 1995) is the standard accessible English edition.

The Twelve Anathemas (November 430)

The Twelve Anathemas attached to Cyril's Third Letter to Nestorius (November 430) are the most precisely-articulated formal statement of the Cyrilline Christological position. Each anathema condemns a specific Nestorian position: against the denial that Mary is properly called theotokos; against the denial that the Word was personally united to the flesh; against the division of Christ into two persons; against the attribution of human suffering to "another beside the Word"; etc. The Twelve Anathemas were formally received at the Council of Ephesus (431); they were not formally received at Chalcedon (which preferred the milder Cyrilline-Antiochene Formula of Reunion of 433 as the basis for the Definition); the Oriental Orthodox tradition has continued to receive the Twelve Anathemas explicitly. The Reformed reader engages the Twelve Anathemas as substantive Christological theology while noting that Chalcedon's preferred Cyrilline articulation was the more moderate Formula of Reunion.

Letters to Nestorius and Acacius

Cyril's correspondence with Nestorius — the First, Second, and Third Letters — is the major source for the Cyrilline articulation of the Christological doctrine in its developing form. The Second Letter ("Epistola Synodica," sometimes called the "Dogmatic Letter") was formally received at the Council of Ephesus (431) and is the principal Cyrilline document the Reformed reader engages alongside On the Unity of Christ. The 433 Letter to Acacius of Beroea (preserving the Formula of Reunion with John of Antioch) is the second principal Cyrilline document received at later councils. Lionel R. Wickham's critical edition of Cyril of Alexandria: Select Letters (Oxford Early Christian Texts, 1983) is the scholarly standard.

The commentary corpus

Cyril's exegetical corpus is substantial. The commentary on John (in 12 books, of which 7 substantially survive) is the major Johannine commentary of the patristic period after Origen. The commentary on Luke survives partly in Greek and partly in a Syriac translation. The commentary on Isaiah is a major prophetic commentary. The Glaphyra ("Elegant Comments") on the Pentateuch is a typological-Christological reading of the OT narratives. The commentary on the Minor Prophets is substantively typological. Cyril's exegesis is consistently Christological — reading the OT and NT together as the unified witness to the eternal Word incarnate — and pastorally rich. The Reformed reader engaging his exegesis profits from the Christological depth while noting some allegorical excess characteristic of the Alexandrian tradition. See Hermeneutics.

Against Julian the Apostate

The emperor Julian "the Apostate" (361 – 363), whose brief pagan reaction had attempted to roll back the Constantinian Christian establishment, had written a substantial anti-Christian work Against the Galileans (preserved only in fragments embedded in Cyril's refutation). Cyril's Against Julian, written some seventy or eighty years after Julian's work, is the major patristic engagement with the most substantive ancient pagan philosophical critique of Christianity after Celsus. The first ten books survive; the original was probably twenty or thirty. The work is one of Cyril's most accessible writings and is a substantial Christian apologetic engagement with the ancient pagan philosophical objections to Christianity. See Apologetics.

Nestorius — the principal Christological opponent

Nestorius came out of the Antiochene exegetical and theological tradition that emphasised the full integrity of Christ's humanity and that worked from a "two natures" framework rather than the Alexandrian "one nature" emphasis. His sermons against theotokos — arguing that Mary bore only the man Jesus and not the eternal Word — pressed the Antiochene framework into territory the broader Christian tradition could not accept. Whether the historical Nestorius actually held the "two persons" Christology Cyril attributed to him is contested in modern scholarship; some scholars (since Friedrich Loofs's Nestoriana of 1905, and especially since the rediscovery of Nestorius's Bazaar of Heracleides in Syriac translation in 1895) have argued that Nestorius's substantive position was closer to Antiochene orthodoxy than Cyril's polemic allowed. The Council of Ephesus (431) deposed Nestorius; the broader catholic tradition has continued to read Cyril's polemic as substantively correct on the principal point (the one Christ is one personal subject, not two); the contemporary Common Christological Declaration between the Catholic Church and the Assyrian Church of the East (1994) has substantially rehabilitated the historic Assyrian Christology while preserving the Cyrilline-Chalcedonian conviction.

John of Antioch and the moderate Antiochene party

John of Antioch led the moderate Antiochene party that resisted both Nestorius's most provocative formulations and Cyril's most extreme Twelve Anathemas. The 433 Formula of Reunion — drafted substantially by Theodoret of Cyrus on the Antiochene side and accepted by Cyril — was the negotiated settlement between the Cyrilline and Antiochene parties that preserved both substantive Christological commitments (the one personal subject of the eternal Word incarnate; the genuine completeness and integrity of the human nature) and provided the substantive Christological vocabulary that Chalcedon would build on. The Cyril-John reconciliation is one of the bright spots of fifth-century Christological history.

Theodoret of Cyrus — the careful Antiochene critic

Theodoret of Cyrus was the principal Antiochene theological mind of his generation. He drafted the Formula of Reunion (433); he was a long critic of Cyril's Twelve Anathemas (his Refutation of the Twelve Anathemas is preserved); he was deposed at the Robber Synod of Ephesus II (449) for his opposition to Eutyches; he was rehabilitated at Chalcedon (451) and lived to write his Ecclesiastical History. Theodoret's careful Antiochene Christology — defending the full integrity of Christ's humanity, holding firm on the personal unity of Christ, refusing both Nestorian extremes and Cyrilline pressed too far — is one of the bright spots of fifth-century Eastern theological work, even where Cyril's mainstream became the dominant Christological tradition.

The Hypatia incident and the conflict with Orestes

The most morally serious incident of Cyril's patriarchate was the murder of the pagan philosopher Hypatia in March 415. Hypatia was a brilliant Neoplatonist mathematician and teacher at Alexandria, daughter of Theon, and an associate of the prefect Orestes. The Christian mob that killed her was led by a lector named Peter; she was lynched at the Caesareum (a church on the Alexandrian forum) and her body desecrated. The direct culpability of Cyril is contested in the ancient and modern sources. The hostile pagan historian Damascius (c. 480 – 540) holds Cyril substantially responsible; the Christian church historian Socrates Scholasticus (c. 380 – c. 439) attributes the murder to fanatical Christian mob action without naming Cyril as the instigator; modern scholarly judgement is divided. The substantive moral failure of the incident — that a Christian mob, with leadership identifiable in the Alexandrian Christian community, murdered a brilliant non-Christian woman with no plausible justification — is undeniable, and Cyril as patriarch bears responsibility for the climate in which it occurred even where direct culpability cannot be proven. The Reformed Christian does not soften this. Maria Dzielska's Hypatia of Alexandria (Harvard, 1995) is the standard modern scholarly biography.

The patristic and Byzantine reception

Cyril's substantive Christology became the foundation of the Byzantine Christological tradition. The post-Chalcedonian Eastern Orthodox theological work — Leontius of Byzantium, Leontius of Jerusalem, Maximus the Confessor, John of Damascus — built on the Cyrilline-Chalcedonian foundation. The "Neo-Chalcedonianism" of the sixth century, which integrated the Cyrilline conceptuality (especially the "one composite hypostasis" articulation) more explicitly into the Chalcedonian framework, is the mature Byzantine Christological position.

The Oriental Orthodox reception — Severus of Antioch and beyond

The Oriental Orthodox churches — Coptic, Ethiopian, Eritrean, Armenian Apostolic, Syrian Orthodox, Indian Malankara — preserve a Cyrilline Christology in continuity with Cyril's own preferred terminology ("one nature of God the Word incarnate"). The principal post-Chalcedonian theologian on this side was Severus of Antioch (c. 465 – 538). The Oriental Orthodox tradition explicitly receives Cyril and the Council of Ephesus (431) but does not receive Chalcedon (451); the modern Christological dialogues since the mid-twentieth century have substantially recognised that the Oriental Orthodox Christology is substantively continuous with the Cyrilline-Chalcedonian framework while differing in terminological emphasis. See Chalcedon.

The Roman Catholic reception

The Latin medieval and Roman Catholic Christological tradition received Cyril substantively. Aquinas's Christology in the Summa Theologiae Tertia Pars cites Cyril substantially and works in the Cyrilline-Chalcedonian framework. Modern Roman Catholic Cyril scholarship — Aloys Grillmeier's monumental Christ in Christian Tradition; the work of Brian Daley, John McGuckin (an Eastern Orthodox-Roman Catholic engagement), Norman Russell, and others — has been among the most substantial contemporary patristic scholarly engagements.

The Reformation reception

The Reformation reception of Cyril was selective but substantive. Luther and Calvin both cite Cyril at Christological points, particularly on the genuine incarnation and the personal unity of Christ. The Belgic Confession and the Heidelberg Catechism's Christological articulation stands substantively in the Cyrilline-Chalcedonian framework. Where the Reformation diverged from later Latin medieval reception of Cyril was on questions less central to Cyril's own substantive concern (the medieval Marian dogmas, the medieval scholastic elaborations) rather than on the substantive Christology. The Reformed engagement with Cyril through the Reformed confessions is therefore substantial.

The modern Reformed-evangelical retrieval

The modern Reformed retrieval of Cyril has been one of the bright spots of contemporary Reformed-evangelical theological work. Donald Fairbairn's Grace and Christology in the Early Church (Oxford, 2003) is the major Reformed-evangelical engagement with Cyril; Robert Letham's The Holy Trinity (P&R, 2nd ed., 2019) draws on Cyril; Donald Macleod's The Person of Christ (IVP, 1998) engages Cyril substantively; the broader Reformed engagement with Cyril (Fred Sanders, Stephen R. Holmes, Oliver Crisp, Steven Duby) has been substantial. The Reformed reader engaging Cyril today inherits a more sophisticated scholarly resource than the Reformation tradition had available.