However, the second-century Pope Anicetus, wishing to demonstrate that he spoke with the authority of Peter, reported that Peter had been beheaded in Rome. A century later, Origen changed this to say that Peter was sentenced to crucifixion but, feeling unworthy of being crucified like Jesus, asked to be crucified upside down. Thus, a tradition was born, that Peter had travelled to Rome as the apostle to the Romans and had been executed there. Pope Anicetus wanted Peter to have been there, but it seems unlikely that Peter really had been.
Additional Answer:
There is no Scripture indicating Peter being in Rome. Paul never mentions Peter in his Epistle to the Romans. However, it appears both Paul and Peter were originally buried in Rome. Emperor Nero martyred Paul by beheading him circa 65-66 A.D. and then being buried on the Ostian Way and Peter shortly thereafter also in Rome circa 67-68 A.D. There are many pieces of ancient literature to also confirm that Simon Magus who masqueraded as Peter was also buried in Rome.
Furthermore, there is a letter of Pope Vitalian's decision in 656 A.D. that the Church was not interested in the remains of the two Apostles and therefore, ordered them sent to Oswy, King of Britain. Here is an excerpt from the Pope's letter to the King, 'However, we have ordered the blessed gifts of the holy Martyrs, that is, the relics of the blessed apostles, Peter and Paul, and of the holy martyrs Laurentius, John, and Paul, and Gregory, and Pancratius, to be delivered to the bearers of these our letters, to be by them delivered to you (Bedes 'Ecclesiastical History,' bk. III, ch. 29). Just astounding that the bones or relics as this Pope called them would be sent from Rome to Britain - the new land of Israel!!
Peter and Paul were very active spreading Christianity. They took it to Europe and Peter dies in Rome.
The preaching of Sts. Peter & Paul.
It was Peter as he was crucified in Rome.
The Bible does not say who went to Rome to win converts to Christianity. However, Paul's Epistle to the Romans demonstrates that by the fifties at the latest, there was already a flourishing Christian community in Rome. Paul is believed to have gone to Rome, but probably not with the intention of converting people to Christianity. Peter is traditionally thought to have moved to Rome, to head the church there, but there is no actual evidence that he ever visited Rome. Clement of Rome, while mentioning Peter, gives no hint that he knew of Peter having been in Rome a few decades earlier.
The apostles commonly believed to have died in Rome are Peter and Paul. However, there is no evidence that Peter ever went to Rome, and, while Paul no doubt went to Rome, it is uncertain that he died there. However, the greatest prestige that the bishops of Rome enjoyed in the early centuries of Christianity accrued to them because they claimed to be the custodians of the tombs of Saints Peter and Paul.
No, Saint Peter was buried in Rome after his execution there. Perhaps no other saint in the history of Christianity has had his tomb more thoroughly investigated by scientists and theologians than that of Saint Peter.
he legalized Christianity in Rome, but did not make Rome officially a Christianity state
Because Rome is where the successor of St. Peter is the bishop. This person is the pope. St. Peter was given special authority by Jesus and was martyred in Rome. When he died, the his authority went to the next pope. The pope now is Pope Benedict XVI. Paul was also martyred in Rome and he is also very important to Christianity.
Saints Peter and Paul went to Rome to establish the Catholic faith there, but it was already set up by Our Blessed Lord and the Holy Spirit working through the Apostles in Jerusalem, thus they brought the Catholic Church to Rome, they did not go there to set it up. At the links below is information about the tombs of St. Peter (under the high altar in St. Peter's Basilica) and the St. Paul (in St. Paul Outside the Walls).
He conquered the Saxons to bring them to Christianity.
Christianity began to spread to Egypt and Rome in the 1st century AD. It is believed that the apostle Mark founded the Christian community in Alexandria, Egypt, around 42 AD. In Rome, Christianity gained traction through the efforts of early missionaries and the eventual martyrdom of apostles such as Peter and Paul, with significant growth occurring by the mid-1st century. By the end of the century, Christianity had established a notable presence in both regions.
St. Peter died in Rome, Italy, where he was crucified upside down. This location holds significance in Christian history as it is believed to be where St. Peter was buried and where the first Pope of the Catholic Church established his leadership, making Rome a central hub for Christianity.