Leo, bishop, to the most beloved sons Faustus, Martinus, and the other archimandrites.
Leo Decrees Eutyches’s View Detestable and Desires His Restoration to Communion
Since, on account of the cause of faith which Eutyches turbulently attempted to disturb, I have judged it fitting to send envoys from my side1 to assist in the defense of truth, I have likewise thought it right to direct these writings to your beloved persons — being certain that you are so devoted to piety that you can in no way calmly endure blasphemous and impious utterances, since the apostolic teaching abides in your hearts, by which it is said: If anyone preaches to you a gospel other than what you have received, let him be anathema (Gal. 1:9).
We likewise decree the view of the aforementioned — justly condemned, as the reading of the acts makes clear — to be detestable: so that, if the foolish assertor persists in his perversity, he will share the fellowship of those whose error he has followed.2 For he will rightly find himself outside the Church of Christ who denies that there exists in Christ a human nature — that is, our own.
Yet if, corrected by the mercy of God’s Spirit, he acknowledges the impiety of his error and condemns with full satisfaction what Catholics execrate, We will that mercy not be denied him, so that the Lord’s Church suffers no loss — since the one who comes to his senses can be received back, and error alone must be excluded.
Concerning the great mystery of piety,3 in which our justification and redemption through the Incarnation of the Word of God consists — what our teaching from the Fathers’ tradition declares has now been sufficiently explained, as I believe, in the letter I sent to my brother Bishop Flavian, so that through the instruction of your prelate you may know what we wish to be fixed in the hearts of all the faithful according to the Gospel of our Lord Jesus Christ.
Given on the Ides of June, in the consulship of Asturius and Protogenes, most illustrious men.4
Footnotes
- ↩ The phrase de latere meo — “from my side” or “from beside me” — designates a personal representative sent from the pope’s immediate presence. The envoys dispatched to the Council of Ephesus II were the bishop Julius of Puteoli, the presbyter Renatus (who died en route in Sicily), and the deacon Hilarus, later Pope Hilarius (461–468). These three are named in Letter XXXI to Pulcheria, where Leo describes them as those in whom his presence at the council is to be understood. The formula anticipates the canonical designation legatus a latere, denoting a representative of the highest rank sent directly from the Roman bishop’s side rather than through intermediary channels.
- ↩ The verb decernimus — “we decree” — is Leo’s characteristic term for issuing an authoritative judgment from the Apostolic See. He is not simply endorsing Flavian’s synodal condemnation; he is extending it with the authority of Rome. The phrase etiam nos — “we likewise” — acknowledges the prior Constantinople synodal act while making plain that Leo’s decree stands independently alongside it: a local Eastern sentence has become, through Leo’s act, a judgment of the Roman see. Compare the use of decernimus in Letters V and VI, where Leo employs the same verb in establishing the Illyrian vicariate’s authority.
- ↩ The Latin is sacramentum pietatis magnae, echoing 1 Tim. 3:16 in the Vulgate: magnum est pietatis sacramentum — “great is the mystery of piety.” Leo uses sacramentum here not in the specific liturgical sense but in its classical theological meaning of a sacred mystery. The great mystery of piety is the Incarnation itself: the Word made flesh for our justification and redemption. By invoking this Scriptural formula, Leo frames his commendation of the Tome in apostolic terms — the mystery the Apostle named is the same mystery Leo has now expounded in writing for the council.
- ↩ June 13, 449 — the date shared by Letters XXVII–XXXI, the full cluster of letters dispatched alongside the Tome. By writing to the archimandrites on the same day as his letters to Flavian, Pulcheria, and the emperor, Leo ensures that all key constituencies in Constantinople are simultaneously reached: the bishop, the imperial court, and the monastic leadership. The consulship of Asturius and Protogenes confirms the year 449.
Historical Commentary