“Since, however, it would be very tedious, in such a volume as this, to reckon up the successions of all the Churches, we do put to confusion all those who, in whatever manner, whether by an evil self-pleasing, by vainglory, or by blindness and perverse opinion, assemble in unauthorized meetings; [we do this, I say,] by indicating that tradition derived from the apostles, of the very great, the very ancient, and universally known Church founded and organized at Rome by the two most glorious apostles, Peter and Paul; as also [by pointing out] the faith preached to men, which comes down to our time by means of the successions of the bishops. For it is a matter of necessity that every Church should agree with this Church, on account of its pre- eminent authority, that is, the faithful everywhere, inasmuch as the apostolical tradition has been preserved continuously by those [faithful men] who exist everywhere.” Irenaeus, Against Heresies, 3:3:2 (A.D. 180).
“And he says to him again after the resurrection, ‘Feed my sheep.’ It is on him that he builds the Church, and to him that he entrusts the sheep to feed. And although he assigns a like power to all the apostles, yet he founded a single Chair, thus establishing by his own authority the source and hallmark of the (Church’s) oneness. No doubt the others were all that Peter was, but a primacy is given to Peter, and it is (thus) made clear that there is but one flock which is to be fed by all the apostles in common accord. If a man does not hold fast to this oneness of Peter, does he imagine that he still holds the faith? If he deserts the Chair of Peter upon whom the Church was built, has he still confidence that he is in the Church? This unity firmly should we hold and maintain, especially we bishops, presiding in the Church, in order that we may approve the episcopate itself to be the one and undivided.” *Cyprian, The Unity of the Church, 4-5 (A.D. 251-256). *
“After such things as these, moreover, they still dare–a false bishop having been appointed for them by, heretics–to set sail and to bear letters from schismatic and profane persons to the throne of Peter, and to the chief church whence priestly unity takes its source; and not to consider that these were the Romans whose faith was praised in the preaching of the apostle, to whom faithlessness could have no access.” Cyprian, To Cornelius, Epistle 54/59:14 (A.D. 252).
”The reason for your absence was both honorable and imperative, that the schismatic wolves might not rob and plunder by stealth nor the heretical dogs bark madly in the rapid fury nor the very serpent, the devil, discharge his blasphemous venom. So it seems to us right and altogether fitting that priests of the Lord from each and every province should report to their head, that is, to the See of Peter, the Apostle." *Council of Sardica, To Pope Julius (A.D. 342). *
“And this case likewise is to be provided for, that if in any province a bishop has some matter against his brother and fellow-bishop, neither of the two should call in as arbiters bishops from another province. But if perchance sentence be given against a bishop in any matter and he supposes his case to be not unsound but good, in order that the question may be reopened, let us, if it seem good to your charity, honour the memory of Peter the Apostle, and let those who gave judgment write to Julius, the bishop of Rome, so that, if necessary, the case may be retried by the bishops of the neighbouring provinces and let him appoint arbiters; but if it cannot be shown that his case is of such a sort as to need a new trial, let the judgment once given not be annulled, but stand good as before.” Council of Sardica, Canon III (A.D. 343-344).
“Bishop Gaudentius said: If it seems good to you, it is necessary to add to this decision full of sincere charity which thou hast pronounced, that if any bishop be deposed by the sentence of these neighbouring bishops, and assert that he has fresh matter in defense, a new bishop be not settled in his see, unless the bishop of Rome judge and render a decision as to this.” *Council of Sardica, Canon IV (A.D. 343-344). *
“Supposing, as you assert, that some offence rested upon those persons, the case ought to have been conducted against them, not after this manner, but according to the Canon of the Church. Word should have been written of it to us all, that so a just sentence might proceed from all. For the sufferers were Bishops, and Churches of no ordinary note, but those which the Apostles themselves had governed in their own persons…For what we have received from the blessed Apostle Peter, that I signify to you; and I should not have written this, as deeming that these things were manifest unto all men, had not these proceedings so disturbed us.” Athanasius, Pope Julius to the Eusebians, Defense Against the Arians, 35 (A.D. 347).
However, I know there are important things that were not contained in the written word.
