The Early Church and Peter's Primacy

Letter XLIII, from Pope Leo to Emperor Theodosius

Synopsis: Leo complains of the Ephesine Robbery, requests affairs remain as before the pseudo-synod, urges a council in Italy.

Leo, bishop, to the most glorious and clement Emperor Theodosius.

Chapter I: Leo Complains of the Ephesine Robbery

From the beginning, in councils held, we have received such confidence from the blessed Peter, Prince of the Apostles, that we have authority to defend the truth for our peace, so none may disturb it, fortified as it is, while harm is swiftly removed.

The episcopal council you ordered in Ephesus concerning Flavian is proven to harm the faith and wound all the churches. [Lacuna] These things we know not from uncertain report but from the most reverend bishops sent by us and our faithful deacon Hilarus, narrator of the acts.

This proceeded from the fault that those gathered did not judge with pure conscience and right judgment, per custom, concerning the faith and the erring. We know not all who should have convened were present; some were rejected, others admitted who, by the aforementioned priest’s judgment, gave captive hands to impious subscriptions, knowing it would harm their status unless they obeyed, issuing a sentence that injured all churches.

Our representatives, sent from the Apostolic See, seeing this so impious and contrary to the Catholic faith, reported it to us.

Chapter II: Leo Requests Affairs Remain as Before the Pseudo-Synod

Hence, most tranquil of princes, we beseech you to remove the peril to religion and faith from your piety’s conscience, lest human presumption violate Christ’s Gospel. Behold, I, most Christian and venerable emperor, with my fellow priests, fulfilling sincere love’s duty toward your clemency — desiring you to please God above all, prayed for by the Church for you — beseech before the indivisible Trinity’s one Deity, injured by such deeds yet guardian and author of your empire, and before Christ’s holy angels: that you order all to remain as before any judgment, until a greater number of priests from the whole world convene.

Do not bear another’s sin’s burden, for we fear, as we must say, that the indignation of Him whose religion is being scattered be provoked. Keep before your eyes the glory of blessed Peter, the shared crowns of all apostles, and the martyrs’ palms, whose sole cause of suffering was confessing the true divinity and humanity in Christ.

Chapter III: Leo Urges a Council in Italy

As this mystery is now impiously opposed by a few imprudent ones, all our region’s churches and priests supplicate your clemency with groans and tears. Since our representatives faithfully protested and Bishop Flavian gave an appeal’s libel, order a general synod in Italy to repel or mitigate all offenses, so nothing remains doubtful in faith or divided in charity.

With bishops of the Eastern provinces convened, those led astray by threats and injuries from truth’s path may be restored by salutary remedies. Those with harsher cause, if they accept better counsels, may not fall from the Church’s unity. This is necessarily required post-appeal, as the Nicene canons’ decrees, established by the world’s priests, attest.

Favor the Catholics, per your and your parents’ custom, granting freedom to defend the faith. As we pursue the Church’s and your kingdom’s cause and salvation, that your provinces enjoy just peace, defend the Church’s unshaken state against heretics, so Christ’s right hand may defend your empire.

Dated the third day before the Ides of October, in the consulship of Asturius and Protogenes, most illustrious men.

Source/Reference

Notes / Historical Commentary

Letter XLIII is Leo’s formal complaint to Theodosius II about the Council of Ephesus II — the gathering of August 1–22, 449 that he would elsewhere name a latrocinium, a robbery. It is dated October 13, 449, the same day as Letter XLIV, which presents the same appeal more fully with the joint voice of Leo and the assembled Roman Synod. The existence of two appeals on the same day to the same emperor reflects Leo’s practice in crisis situations: the same essential argument is dispatched simultaneously through multiple documents, each calibrated for its immediate purpose.

The opening of Chapter I sets the theological register that governs the entire post-Latrocinium correspondence. Leo grounds his authority not in any conciliar decree — which would have been awkward, given that Ephesus II was itself a council — but in the confidence received from Peter and the apostles “from the beginning.” This framing is deliberate. The council erred; Peter’s authority did not. Theodosius is being asked not to defer to a conciliar outcome but to act in accordance with the apostolic foundation from which all legitimate councils derive their authority. The move is characteristic of Leo’s entire strategy in the aftermath of Ephesus II: the appeal is always pushed beneath the level of the conciliar mechanism that Dioscorus had exploited, to the Petrine bedrock that no council can dislodge.

Chapter I’s closing sentence — “our representatives, sent from the Apostolic See, seeing this so impious and contrary to the Catholic faith, reported it to us” — merits the reader’s attention. Leo’s legates were present at Ephesus II as representatives of the Apostolic See. Their report back to Rome is not merely personal testimony; it is the Apostolic See’s own monitoring of an Eastern council. The council acted within the sight of the Roman see, and what the Roman see’s agents saw, Rome now officially knows and officially rejects.

Chapter III’s request for an Italian council, repeated in every post-Latrocinium letter, is the practical consequence of the theological premise. If the Apostolic See is the standard against which the council’s acts are measured, the corrective council should sit within the Apostolic See’s sphere — where the canons govern rather than imperial and Alexandrian pressure. Theodosius refused until his death in July 450. At Chalcedon in 451, held near Constantinople but under conditions Leo’s correspondence had largely shaped, everything the three chapters of this letter requested was accomplished.

The Early Church and Peter's Primacy