"Muh keys"
St. Pope Boniface I, Letter 14 (422)
"The structure (institutio) of the universal Church took its origin from the honor given to Peter. All rule in the Church consists in this, that from Peter, as from a fountainhead, the discipline of the whole Church has been derived as this church grows and expands…It is certain that this church is related to the churches spread over the whole world as the head to its members. Whoever cuts himself off from this church places himself outside the Christian religion, since he no longer remains part of its structure. I hear that certain bishops want to set aside the apostolic constitution of the Church and are attempting to introduce innovations against Christ’s commands. They seek to separate themselves from communion with the Apostolic See, or, more precisely, from its authority."
Source:
eternalchristendom.com/becom…
Pope Vigilius, To Profuturus of Braga (538)
"To no one well or ill informed is it doubtful that the Roman Church is the foundation and the mold of the churches (fundamentum et forma sit ecclesiarum), from which no one of right belief is ignorant that all churches have derived their beginning. Since, though the election of all the Apostles was equal, yet a pre-eminence over the rest was granted to blessed Peter, when he is called Cephas, being the head and beginning of all the Apostles: and what hath gone before in the head, must follow in the members. Wherefore the holy 193 | 194 Roman Church, through his merit consecrated by the Lord’s voice and established by the authority of the holy Fathers, holds the Primacy over all churches, to which as well the highest concerns of bishops, their causes, and complaints, as the greater questions of the churches, are ever to be referred. For he who knows himself to be set over others, should not object to one being placed over himself. For the Church itself, which is the first, has bestowed its authority on the rest of the churches with this condition, that they be called to a part of its solicitude, not to the fullness of its power. Whence the causes of all bishops who appeal to the Apostolic See, and the proceedings in all greater causes, are known to be reserved to that holy See; especially as in all these its decision must always be awaited: and if any bishops attempt to resist this course, let him know that he will give account to that holy See not without endangering his own rank."
Source:
eternalchristendom.com/becom…
Ecumenical Council of Ephesus (431)
July 11 Session
"Philip, presbyter and legate of the apostolic see, said: “It is doubtful to no one, rather it has been known in all ages, that the holy and most blessed Peter, the leader and head of the apostles, the pillar of the faith, and the foundation of the Catholic Church, received the keys of heaven from our Lord Jesus Christ the savior and redeemer of the human race, and was given the power to bind and unloose sin [Matt. 16:19], and that he lives and performs judgment, until now and always, through his successors. In accordance with this system, his successor and representative, our holy and most blessed pope Bishop Celestine, has sent us to this council as substitutes for his presence, a council that [was convoked] by the most Christian and most philanthropic emperors, who keep in mind and always protect the Catholic Faith, and who have protected and protect the apostolic teaching handed down to them till this day by their most pious and most philanthropic fathers and grandfathers of holy memory…"
eternalchristendom.com/becom…
We can produce dozens of such quotes from the first millennium. "Muh keys" was a first millennium argument of the claims of the bishop of Rome.