The Early Church and Peter's Primacy

Letter LXX, from Pope Leo to Empress Pulcheria

Synopsis: Leo writes to Pulcheria Augusta to express his joy at her devotion to renewing ecclesiastical peace, to explain why he has deferred writing to Anatolius of Constantinople while awaiting his profession of faith — requiring assent to either Cyril’s letter to Nestorius or Leo’s own letter to Flavian — and to state that whoever does not follow this confession cuts himself off from the bond of Catholic unity; sending legates Abundius, Asterius, Basilius, and Senator to offer the form of faith; and requesting that if any still deviate, a universal council be held within Italy.

Leo, bishop, to Pulcheria Augusta.

Leo Awaits Anatolius’s Profession of Faith; The Tome or Cyril’s Letter Required; The Italian Council Sought

I rejoice in the faith of your clemency, which you worthily devote to renewing the ecclesiastical peace that has been seen to be disturbed by the dissensions of certain persons. It especially pertains to your glory that, with all the scandals the enemy has stirred up against the Catholic faith removed, one and the same confession of truth may reign throughout the whole world — restored more easily and surely if no seeds and no traces of perverse opinions remain.

Yet what is my part I must not neglect: to ascertain, namely, what the bishop of Constantinople holds concerning the Incarnation of the Son of God — especially since harsh things preceded his ordination, and he ought to have sent us writings that would clearly demonstrate him to be free from the contagion of this error that has newly emerged. Desiring therefore to have secure concord with him and to extend to him the favor of brotherly charity, I deferred writing to him for a time — not denying affection, but awaiting the manifestation of Catholic truth.

What I require is simple and absolute: that, setting aside the labor of lengthy disputations, he assent to the letter of Cyril of holy memory, bishop of Alexandria — which he sent to Nestorius, in which he both refutes Nestorius’s error and expounds the faith of the Nicene definition — or to my letter directed to Flavian of holy memory, bishop. Having diligently reviewed these, let the Constantinopolitan bishop unhesitatingly acknowledge what he must repudiate — what ignorant folly dared define against the pure and singular faith — for my confession and that of the holy Fathers on the Lord’s Incarnation is in all things concordant and one. Whoever judges it not to be followed cuts himself off from the bond of Catholic unity — though we desire that all be restored intact.

To achieve the salutary measures more swiftly, I sent my brothers and fellow bishops Abundius and Asterius, and the most proven presbyters Basilius and Senator, to offer your clemency the form of faith we preach according to the doctrine of the venerable Fathers — and, with the circumlocutions by which truth is usually obscured removed, to show what the approved bishops of the whole world have defended concerning the Incarnation of the Son of God. After divine grace, it is fitting that they be aided by your holy piety, lest an imprudent purpose proceed to the disturbance of the whole Church — since with correction applied, all must return to the concord of one confession.

If from it some perhaps deviate, let a universal council of bishops be held within Italy, with your clemency’s support, so that with the art of deception removed, it may at last be clear what deeper deliberation must restrain or heal. This will profit both the universal Church and your empire, if one God, one faith, and one mystery of human salvation is held by the confession of the whole world.

Given on the seventeenth day before the Kalends of August, in the seventh consulship of Valentinian Augustus and in the consulship of Avienus, most illustrious men.

Source/Reference

Notes / Historical Commentary

Letter LXX is the parallel to Letter LXIX — dispatched to Pulcheria on the same day (July 16, 450) as LXIX went to Theodosius, covering the same ground: Anatolius’s required profession of faith, the Cyrillian-or-Tome alternative, the communion-cut-off formula for dissenters, the legate dispatch, and the Italian council request. Read alongside LXIX, it displays Leo’s consistently dual-track approach to the Eastern imperial court throughout the post-Latrocinium period: he never addresses one without addressing the other, understanding that Pulcheria and Theodosius represent different relationships and require different registers.

The difference in tone between the two letters is instructive. In Letter LXIX to Theodosius, Leo is juridical and measured — he presents conditions, invokes canons, dispatches legates with formal credentials, and frames his requests in the language of synodal consensus. With Pulcheria, he is warmer and more direct: “I rejoice in the faith of your clemency,” “it especially pertains to your glory.” He can speak to her as an ally rather than an obstacle, as someone whose own convictions he trusts and whose intercession he genuinely values. Pulcheria had been the moving force behind the Council of Ephesus I in 431, had been in correspondence with Leo since the early Eutychian crisis, and had received Leo’s characterization of her as one “commissioned with a Petrine legation” (Letter XLV). She is the court figure Leo has cultivated most carefully throughout the crisis, and by July 450 she is his most reliable eastern ally.

The phrase “harsh things preceded his ordination” — Leo’s diplomatic reference to the Latrocinium — is worth pausing over in this context. Leo is writing to the woman who had been Flavian’s most important protector at the Constantinople court, who had received Leo’s grief-stricken letters about Flavian’s fate, and who understood better than almost anyone what Dioscorus had done at Ephesus. The understatement is a form of shared knowledge: between Leo and Pulcheria, “harsh things” carries the full weight of Flavian’s death without needing to be spelled out. The bond the phrase creates — of two people who know what was really done — is part of why Leo could write to Pulcheria as he did and expect her to act.

The Early Church and Peter's Primacy