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© 2026 · 1.7.2 · Public-domain texts unless otherwise noted.

St. Cyril of Alexandria

Icon of St. Cyril of Alexandria

St. Cyril of Alexandria

Patriarch of Alexandria·Feast June 9

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The patriarch whose Christology defeated Nestorianism at the Council of Ephesus and whose commentary on John defends the eternal divinity of the Word.

Born
c. 376 (Alexandria or its surrounds)
Reposed
June 27, 444
See
Alexandria
Feast
June 9 · January 18

Cyril was born about 376 to a notable Alexandrian family and trained from his youth in Scripture and the writings of Athanasius, his predecessor by two generations on the throne of St. Mark. As a young man he spent five years among the monks of the Egyptian desert before returning to the city to assist his uncle, the patriarch Theophilus.

He succeeded Theophilus in 412 and would govern the Church of Alexandria for thirty-two years. His earliest works are exegetical: a long commentary on John, a parallel commentary on Luke, a treatise on the Trinity in dialogue form. He read every line of Scripture against the question that mattered to him most: who is Christ?

In 428 Nestorius, archbishop of Constantinople, denied that the Virgin Mary should be called Theotokos, the God-bearer, on the grounds that Christ had two persons. Cyril answered with twelve anathemas and rallied the Church. At the Third Ecumenical Council at Ephesus in 431, the title Theotokos was vindicated and Nestorius was deposed.

Cyril spent his last years defending and refining the Christology that the Council had received, and is honored to this day as the Seal of the Fathers for the precision and authority of his teaching. He reposed in Alexandria on June 27, 444.

In his own words

  • And it is with reference to this notion of a union without confusion that we proclaim the holy Virgin to be the mother of God, because God the Word was made flesh and became man, and by the act of conception united to Himself the temple that He received from her.
    St. Cyril of Alexandria, Commentary on the Gospel of Luke, Sermon 1, Luke 2:1-7, tr. Payne Smith, 1859

Events during this saint's life

  • June–July 431The Third Ecumenical Council at Ephesus
Explore the interactive timeline

5 works

  • Commentary on the Gospel of John
    Commentary on the Gospel of JohnThe twelve books, in the Library of the Fathers translation · c. 425Cyril's reading of the Fourth Gospel, ordered by the question who is Christ, given to the Church before the Nestorian crisis erupted. All twelve books, the fullest Greek commentary on St John that survives.
  • Five Tomes Against Nestorius
    Five Tomes Against NestoriusSelections from Books I, II, III, and V · c. 430Cyril's first systematic answer to Nestorius, written in the spring before Ephesus. Quotes Nestorius line by line and refutes him from Scripture, the Fathers, and the rule of faith.
  • Three Epistles to Nestorius
    Three Epistles to NestoriusThe Second Letter, the Third Letter, and the Twelve Anathemas · c. 430The two dogmatic letters and the Twelve Anathemas appended to the third — the conciliar standard received at Ephesus in 431 as the Church's confession of the one incarnate Word.
  • Commentary on the Gospel of Luke
    Commentary on the Gospel of LukeThe surviving sermons, translated from the Syriac · c. 430Cyril's homiletic reading of Luke, preserved chiefly in Syriac. One hundred and thirty-eight sermons carrying the Gospel from the Virgin's consent to the road to Emmaus, and the only patristic commentary this library holds on Luke.
  • Scholia on the Incarnation of the Only-Begotten
    Scholia on the Incarnation of the Only-BegottenA short Christological handbook · c. 435Cyril's compact teacher's syllabus on the Incarnation — the eternal generation, the personal union, the communicatio idiomatum — written for clergy who needed precise definitions after Ephesus.

Books in print

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  • On the Unity of Christ
    On the Unity of ChristBy Cyril of Alexandria · St. Vladimir's Seminary Press, 1995Cyril's mature statement of the union of natures in the one incarnate Word, the doctrinal voice that carried the day at Ephesus and shaped the Chalcedonian definition. John McGuckin's translation.Buy on Amazon
  • Commentary on John, Vol. 1
    Commentary on John, Vol. 1By Cyril of Alexandria · IVP Academic, 2013Books 1–6 of Cyril's twelve-book exegesis of the Fourth Gospel, the first complete modern English translation. David R. Maxwell, working from Pusey's critical Greek text, restores the work to general readability.Buy on Amazon
  • Commentary on John, Vol. 2
    Commentary on John, Vol. 2By Cyril of Alexandria · IVP Academic, 2015Books 7–12 of the Commentary on John, completing Maxwell's translation, including Cyril's exposition of the Last Supper discourses, the high-priestly prayer, and the Resurrection appearances.Buy on Amazon
  • Three Christological Treatises
    Three Christological TreatisesBy Cyril of Alexandria · The Catholic University of America Press, 2014On Orthodoxy to Theodosius, Defense against the Bishops of Oriens, and Defense against Theodoret, the three works in which Cyril explained his Twelve Anathemas to the Emperor and his critics on the eve of Ephesus. Daniel King's translation, the first into English.Buy on Amazon
  • Letters 1–50
    Letters 1–50By Cyril of Alexandria · The Catholic University of America Press, 1987The first half of Cyril's surviving correspondence, including the Second Letter to Nestorius, the Third Letter with the Twelve Anathemas, and the Letter to John of Antioch that sealed the Formulary of Reunion. John I. McEnerney's translation.Buy on Amazon
  • Letters 51–110
    Letters 51–110By Cyril of Alexandria · The Catholic University of America Press, 1987The second and final volume of McEnerney's translation of Cyril's letters, Christological clarifications after the Reunion of 433, pastoral correspondence, and the Letter to Eulogius on the proper reception of the Antiochene formula.Buy on Amazon
  • Festal Letters 1–12
    Festal Letters 1–12By Cyril of Alexandria · The Catholic University of America Press, 2009The annual Paschal letters by which the Alexandrian patriarch announced the date of Pascha and prepared his flock for the great fast, Cyril's pastoral voice, year by year, on repentance, almsgiving, and the meaning of the Resurrection. Philip Amidon's translation.Buy on Amazon
  • Festal Letters 13–30
    Festal Letters 13–30By Cyril of Alexandria · The Catholic University of America Press, 2013The remaining festal letters Cyril sent across his patriarchate, including the letters of the years through and beyond Ephesus, in which the Christological controversy enters his Paschal preaching.Buy on Amazon
  • Cyril of Alexandria
    Cyril of AlexandriaAbout Norman Russell · Routledge, 2000Russell's introduction to Cyril's life, method, and theology, with fresh translations of selections from the major works, the Commentary on John, the Christological treatises, the Against Julian, and the Letters. The standard scholarly entry point.Buy on Amazon
  • Saint Cyril of Alexandria and the Christological Controversy
    Saint Cyril of Alexandria and the Christological ControversyAbout John A. McGuckin · St. Vladimir's Seminary Press, 2004McGuckin's standard study of the fifth-century clash between Cyril and Nestorius, political, theological, and personal, with key primary texts in translation.Buy on Amazon
  • The Appropriation of Divine Life in Cyril of Alexandria
    The Appropriation of Divine Life in Cyril of AlexandriaAbout Daniel A. Keating · Oxford University Press, 2004Keating's comprehensive account of sanctification and deification in Cyril, drawn from the New Testament commentaries and homilies. The definitive monograph on the soteriology that runs beneath Cyril's Christology.Buy on Amazon

At a glance

Born
c. 376 (Alexandria or its surrounds)
Reposed
June 27, 444
See
Alexandria
Feast
June 9 · January 18

Holy St. Cyril of Alexandria, pray to God for us.