"Through envy and jealousy, the greatest and most righteous pillars [of the Church] have been persecuted and put to death. Let us set before our eyes the illustrious apostles. Peter, through unrighteous envy, endured not one or two, but numerous labours and when he had at length suffered martyrdom, departed to the place of glory due to him." Clement of Rome, The First Epistle of Clement, 5 (c. A.D. 96).
"I do not, as Peter and Paul, issue commandments unto you." Ignatius of Antioch, Epistle to the Romans, 4 (c. A.D. 110).
'You have thus by such an admonition bound together the plantings of Peter and Paul at Rome and Corinth." Dionysius of Corinth, Epistle to Pope Soter, fragment in Eusebius' Church History, II:25 (c. A.D. 178).
"Matthew also issued a written Gospel among the Hebrews in their own dialect, while Peter and Paul were preaching at Rome, and laying the foundations of the Church." Irenaeus, Against Heresies, 3:1:1 (c. A.D. 180).
"As Peter had preached the Word publicly at Rome, and declared the Gospel by the Spirit, many who were present requested that Mark, who had followed him for a long time and remembered his sayings, should write them out." Clement of Alexandria, fragment in Eusebius Church History, VI:14,6 (A.D. 190)
"It is, therefore, recorded that Paul was beheaded in Rome itself, and that Peter likewise was crucified under Nero. This account of Peter and Paul is substantiated by the fact that their names are preserved in the cemeteries of that place even to the present day. It is confirmed likewise by Caius, a member of the Church, who arose under Zephyrinus, bishop of Rome. He, in a published disputation with Proclus, the leader of the Phrygian heresy, speaks as follows concerning the places where the sacred corpses of the aforesaid apostles are laid: 'But I can show the trophies of the apostles. For if you will go to the Vatican or to the Ostian way, you will find the trophies of those who laid the foundations of this church.'" Gaius, fragment in Eusebius' Church History, 2:25 (A.D. 198).
"[W]hat utterance also the Romans give, so very near (to the apostles), to whom Peter and Paul conjointly bequeathed the gospel even sealed with their own blood." Tertullian, Against Marcion, 4:5 (inter A.D. 207-212).
'We read the lives of the Caesars: At Rome Nero was the first who stained with blood the rising blood. Then is Peter girt by another (an allusion to John 21:18), when he is made fast to the cross." Tertullian, Scorpiace, 15:3 (A.D. 212).
"Peter...at last, having come to Rome, he was crucified head-downwards; for he had requested that he might suffer this way." Origen, Third Commentary on Genesis, (A.D. 232).
"Thus Peter, the first of the Apostles, having been often apprehended, and thrown into prison, and treated with igominy, was last of all crucified at Rome." Peter of Alexandria, The Canonical Epistle, Canon 9 (A.D. 306).
"[W]hich Peter and Paul preached at Rome..." Lactantius, The Divine Institutes, 4:21 (A.D. 310).
"Peter...coming to the city of Rome, by the mighty cooperation of that power which was lying in wait there..." Eusebius, Ecclesiastical History, II:14,5 (A.D. 325).
"This man [Simon Magus], after he had been cast out by the Apostles, came to Rome...Peter and Paul, a noble pair, chief rulers of the Church, arrived and set the error right...For Peter was there, who carrieth the keys of heaven..." Cyril of Jerusalem, Catechetical Lectures ,6:14-15 (c. A.D. 350).
"And Peter, who had hid himself for fear of the Jews, and the Apostle Paul who was let down in a basket, and fled, when they were told, 'Ye must bear witness at Rome,' deferred not the journey; yea, rather, they departed rejoicing..." Athanasius, Defence of his Flight, 18 (c. A.D. 357).
"I think it my duty to consult the chair of Peter, and to turn to a church whose faith has been praised by Paul...My words are spoken to the successor of the fisherman, to the disciple of the cross." Jerome, To Pope Damasus, Epistle 15 (A.D. 377).
“For if when here he loved men so, that when he [Peter] had the choice of departing and being with Christ, he chose to be here, much more will he there display a warmer affection. I love Rome even for this, although indeed one has other grounds for praising it, both for its greatness, and its antiquity, and its beauty, and its populousness, and for its power, and its wealth, and for its successes in war. But I let all this pass, and esteem it blessed on this account, that both in his lifetime he wrote to them, and loved them so, and talked with them whiles he was with us, and brought his life to a close there.” John Chrysostom, Epistle to the Romans, Homily 32 (c. A.D. 391).
"Which was mere to the interest of the Church at Rome, that it should at its commencement be presided over by some high-born and pompous senator, or by the fisherman Peter, who had none of this world's advantages to attract men to him?" Gregory of Nyssa, To the Church at Nicodemia, Epistle 13 (ante A.D. 394).
"But some people in some countries of the West, and especially in the city, [Rome] not knowing the reason of this indulgence, think that a dispensation from fasting ought certainly not to be allowed On the Sabbath, because they say that on this day the Apostle Peter fasted before his encounter with Simon [Magus]." John Cassian, Institutes, X (ante A.D. 435).
"The whole world, dearly-beloved, does indeed take part in all holy anniversaries [of Peter & Paul], and loyalty to the one Faith demands that whatever is recorded as done for all men's salvation should be everywhere celebrated with common rejoicings. But, besides that reverence which to-day's festival has gained from all the world, it is to be honoured with special and peculiar exultation in our city, that there may be a predominance of gladness on the day of their martyrdom in the place where the chief of the Apostles met their glorious end. For these are the men, through whom the light of Christ's gospel shone on thee, O Rome, and through whom thou, who wast the teacher of error, wast made the disciple of Truth.” Pope Leo the Great (regn. A.D. 440-461), Sermon LXXXII (ante A.D. 461).
Isn't it true that the first time that we hear about this legendary Petrine Bishopric is when Eusebius invents it out of whole papyrus in the 4th century and from Eusebius the legend grew?
One would think that every writer of Roman history from Josephus to Tacitus to Clement of Rome to Justin Martyr to Irenaeus to Hippolytus --- all of whom should have provided atleast some detail regarding such a legendary Bishopric. But they have nothing to say about it at all. Isn't it true that it never happened as even Catholic authors have stepped forward to now admit.