Saint Peter
Simon Peter or St Peter is sometimes called 'prince of the apostles'. Prince comes from 'princeps', latin for chief. In the New Testament there are a couple of lists of the apostles. The order of the names, and even some of the names on the lists, are different in every list. But every time, Peter is listed first. Also, in the ancient songs of the first Christians, the name of Peter is called most.
St Peter in brief
Before Jesus called him, Peter's name was Simon (or Simeon), and he was a fisherman. He was married, because in the same old songs, there is mentioned Jesus healed his mother-in-law. At Caeserea Philippi, Jesus gave him a new name. He said: "You are Peter, and you are the rock on which I will build my church." Peter comes from the Greek used in the New Testament and simply means 'Rock'.
Peter was quite a rash person, and he lacked courage on several moments. An example: before Whitsun, he didn't dare to come out of the building he and the other disciples where hiding themselves. He also betrayed Jesus by denying three times he knew him. Despite this act, Jesus forgive him, because Peter regretted.
Did he really die in Rome?
This is a question posed by many people. The evidence he had really been there, and even died there, is rare, but there are some clues in that direction.
Babylon
At the end of his first letter, Peter wrote: She who is in Babylon, who has a part with you in the purpose of God, sends you her love; and so does my son Mark. (Peter 5:13) As it is certain that Peter wasn't literally at Babylon, the eastern city situated in modern-day Iraq, many people suppose this letter was written by Peter from Rome, and so Babylon is a metaphor for Rome.
Gaius
Circa AD 200, someone called Gaius (one of the early Christians) wrote he could exactly point out the place where both Peter and Paul where laid after they died. Paul was buried at the Via Ostia, Peter at the Vatican Hill. Gaius also tells us the spots are marked by monuments. One of those monuments is found right on the spot of what is now the papal altar of St Peter's. The current altar of was built in the sixteenth century, but it was built over earlier altars, going back to the first one, built by emperor Constantine. Beneath that altar, there is a grave that has been dated to the approximate era of the martyrdom of St Peter.
Crucifixion
The legend said Peter was crucified at circa 65 AD by Emperor Nero. As the tradition said, he should be crucified, but Peter asked to put his cross upside down, so people wouldn't think he was just imitating his master.