Letter X is the pastoral companion to the juridical and imperial documents produced in the Acacian crisis of July–August 484. Letter VI (July 28) is the juridical sentence addressed to Acacius himself. The Edict of Sentence is the public proclamation to the universal Church. Letter IX (August 1) is the doctrinal and constitutional exposition addressed to the emperor Zeno. Letter X is the pastoral address to the Catholic clergy and people of Constantinople — the faithful who would actually have to live under Acacius’s continuing tenure of their see, and who needed to know why their Patriarch had been cut off from Roman communion and how they themselves were to proceed in consequence.

The structure of the letter follows the logic of pastoral reassurance. Felix begins with the disturbance in the Constantinopolitan Catholic community caused by the prevarication of his own legates, Vitalis and Misenus, whose silent communication with the Monophysite party had made it appear that Rome consented to the heretics. He explains what the legates had failed to do — the prescribed contestatio, the formal public protest that would have preserved Rome’s doctrinal position even under coercion — and records that he has now stripped them of both orders and Eucharistic communion. He then moves to the positive pastoral message: Rome has not failed in the defense of the apostolic tradition; the faithful of Constantinople should not lose heart.

The procedural detail about the contestatio deserves careful attention. Rome’s doctrinal integrity is protected not simply by the character of any particular legate but by a specific discipline the legate is required to perform. If the legate is forced into the presence of heretics, he must lodge a formal public protest before he does anything else, so that his subsequent actions — whatever they may be — are known on record to be made under duress and not in assent. This is the Roman position in compressed form: coercion cannot extract Roman consent to heretics, because the legate is required to speak first, to establish the record, and only then to proceed. What Vitalis and Misenus did was not merely to communicate under pressure; they communicated without having spoken first, and their silence was therefore taken as consent. Rome’s juridical integrity was not violated by the coercion but by the omission of the prescribed protest — an omission for which the legates were, and had been forewarned they would be, fully responsible.

The middle of the letter recapitulates the case against Acacius for this pastoral audience. The variability of the Patriarch has been exposed: he had formerly written against Peter Mongus and now communicates with him. His jurisdictional overreach violates the Nicene canons, and on that account he lies under canonical penalty. And he has deprived himself of Roman communion by his choice of associations: qua se ipse privavit, “of which he himself stripped himself.” This self-excommunication formula preserves the coherence of the Roman disciplinary act. Rome’s sentence does not, in Felix’s presentation, invent Acacius’s exclusion from Catholic communion; it recognizes and publishes the exclusion Acacius has already effected by his own choice. Rome is not cutting off a fellow bishop out of ecclesiastical hostility, but juridically confirming what the heretic has already done to himself.

The most striking feature of the letter for the reader interested in how Roman primacy operated at the local level is the Solomon provision. Acacius had deposed a presbyter — apparently a Chalcedonian — to accommodate the heretical party. Felix now instructs the Constantinopolitan Catholics to recognize Solomon’s continued rank, and more broadly to recognize the continuing standing of all clergy whom Acacius may have wrongfully expelled. The reach of Roman authority in the Acacian case is not limited to the condemnation of the Patriarch; it extends to the restoration of particular clergy Acacius had unjustly deposed. The reader should note what this entails. Rome is operating, across the distance from Rome to Constantinople, as an active juridical authority whose ordinances are effective in the local Church — reaching down to the status of individual presbyters — through the recognition of the local Catholic community. The faithful clergy and people of Constantinople are asked to act upon Roman decisions in their own city, preserving the ranks of those wronged and abstaining from the communion of the one condemned. This is not symbolic primacy but operative primacy, exercised at the ordinary pastoral level.

The closing admonition — that all who wish to be partakers of the Catholic faith must abstain from Acacius’s communion — completes the logic of the schism. Communion with Acacius is now incompatible with Catholic identity. The Constantinopolitan Catholics must choose: either be in communion with their Patriarch and share his sentence, or abstain from his communion and preserve their standing in the Catholic Church. The choice Letter IX had posed to the emperor — the communion of the blessed Peter or the communion of the Alexandrian Peter — is here posed to the faithful of Constantinople in its local form. The thirty-five years of the Acacian Schism that follow will be, at the level of ordinary Christian life in the East, a matter of individual believers choosing which side of that line to stand on.