Letter CLXXIII, from Pope Leo to Certain Bishops of Egypt

Letter CLXXIII, dated August 18, 460, is the last surviving letter of Pope Leo I. It is addressed to the nine Catholic bishops of Egypt who had maintained their communion with Rome throughout the three-year Eutychian crisis — faithful men, many of whom had endured exile at Constantinople far from their churches and flocks. The wheel has now come full circle: the crisis that began when Leo wrote to these same men’s colleague Julian of Cos in Letter CXLVII (July 11, 457) is resolved, and the bishops are home.

The formal ratification of the election in the opening chapter is the most detailed canonical confirmation in the final cluster. Leo’s three-part negative formula — no scheming, no sedition, no wickedness — maps exactly onto the three forms of illegitimate episcopal acquisition he has addressed throughout the corpus. Hilary of Arles obtained ordinations in another’s province through ambition (Letter X). Timothy Aelurus seized Alexandria through mob violence (Letters CXLV onward). The general category of wickedness covers every other irregular means treated in Letter CLXVII. Timothy’s election meets none of these vices; it meets every positive canonical condition. Leo’s recognition is not a concession of Roman authority to the Egyptian process; it is the confirmation that the Egyptian process produced what Roman authority requires.

The letter closes the Leonine corpus with a characteristic gesture: Leo writes not simply to celebrate but to direct. Even in this letter of joy and closure, he gives the Egyptian bishops specific pastoral instructions — support the new bishop, apply the same remedies of pastoral patience to the strayed that he has prescribed for Timothy, ensure that the whole regional episcopate acts in concert. The final image he leaves is of the universal Church as a single flock with one shepherd — an image that carries its full ecclesiological weight in the context of a pontificate that had spent twenty years insisting, in letter after letter, that the one shepherd under Christ is known and encountered through the ministry of the Bishop of Rome. And the word that defines his office — sollicitudo — appears in the last clause of the last letter, naming the solicitude of charity and doctrine through which the one shepherd reaches all his sheep.

Looking back across the surviving corpus — from the disciplinary letters of the 440s through the doctrinal battles of the Eutychian controversy, the crisis of Chalcedon, the running confrontations with Anatolius of Constantinople, and the three-year Alexandrian emergency — what is most striking is the consistency of Leo’s self-understanding. He never acts as one bishop among equals offering fraternal advice. He acts as the holder of an office that carries specific obligations: the duty of solicitude for all the Churches, the responsibility to confirm and to define, the authority to direct and, when necessary, to override. That self-understanding is not the invention of later medieval canonists; it is articulated with precision and applied with persistence in every category of his correspondence — disciplinary, doctrinal, canonical, political, and pastoral alike. Whether writing to an emperor, a patriarch, a metropolitan, an exiled bishop, or a local congregation, Leo writes as the voice of Peter, and he writes as though everyone who receives his letters understands what that means.

The formulas through which this self-understanding is expressed are themselves remarkably consistent. The sollicitudo that Leo owes to all the Churches appears from the earliest letters to the last line of this final one — not as a personal virtue but as a structural feature of the Roman see’s office. The non patimur — “We do not permit” — appears when a state of affairs will not be allowed to stand. The vice nostra and vicem meam — Leo acting “in Our stead” through legates — appear whenever authority is delegated without being diminished. The formula Deo inspirante et beatissimo Petro apostolo names Peter as present co-agent of what Leo decrees. The per divinam institutionem grounds the Roman see’s authority not in conciliar grant or imperial favor but in divine institution. The a principali petra of the Tome names Rome’s derivation from the rock of Matthew 16:18. And in the letters approaching the infallibility register — the claim that the Apostolic See’s proclamation of the faith sufficeret, that mea consensione firmavi renders a definition irreversibly sealed, that the apostolica sedes fundata cannot fail — Leo articulates the governing and defining office of the Roman bishop in terms that the First Vatican Council would later recognize and formalize, but did not invent.

Nor is this simply Leo’s private claim. The corpus is full of acknowledgments from those who receive his letters. Valentinian III’s Novella of July 6, 445 — issued in direct response to Leo’s tribunal — formally declares that whatever the Roman bishop has approved or ordered must be received as law by all. The bishops assembled at Chalcedon acclaim Petrus per Leonem locutus est — recognizing the Tome not as the work of a skilled theologian but as the voice of Peter speaking through his successor. Paschasinus of Lilybaeum, Leo’s legate at Chalcedon, opens the proceedings by announcing that he comes in the name of “the apostolic see, which is the head of all the churches.” Anatolius, after years of tension, writes to Leo with deference language that acknowledges what Leo has consistently claimed. The Egyptian bishops of this final letter endured years of exile in fidelity to a Roman communion they understood to be non-negotiable. The pattern of acknowledgment is not universal — Dioscorus resists, Hilary of Arles resists, Anatolius tests the limits of Canon 28 — but the resistance itself confirms the shape of what is being resisted. No one disputes with an equal; they dispute with an authority they wish to evade or limit.

The reader who has followed these letters from beginning to end will also notice what Leo does not do. He does not claim to have invented anything. He grounds every exercise of authority in what Peter received from the Lord, what the Fathers have always maintained, what his predecessors — Damasus, Siricius, Innocent, Celestine — established before him. The Illyrian vicariate was not Leo’s creation; it was Damasus’s, formalized by Siricius, and renewed by Leo. The appellate jurisdiction over the Gallic churches was not Leo’s novelty; it was the established practice to which he calls the Gallic bishops to bear witness. The requirement that Rome confirm ecumenical councils was not asserted for the first time at Chalcedon; it is the presupposition of every letter Leo wrote about Nicaea, Ephesus, and their aftermath. What Leo claims, he claims as inheritance. What he exercises, he exercises as duty. The solicitude of the Roman see is not an ambition; it is, as he says in Letter V, something owed — debetur — by the very nature of the office Peter received and the Roman Church perpetuates. The corpus ends, as it began, with that conviction intact and that solicitude still at work.