Peter's original name was Simon. Christ Himself gave him the name Cephas or Peter when they first met and later confirmed it. This name change was meant to show both Peter's rank as leader of the apostles and the outstanding trait of his character — Peter (in Hebrew Kephas) the Rock. Peter was born in Bethsaida on the Sea of Galilee. Like his younger brother Andrew, he was a fisherman and dwelt at Capernaum. Peter's house often became the scene of miracles, since the Master would stay there whenever He was teaching in that locality. Together with his brothers John and Andrew, Peter belonged to the first of Jesus' disciples (John 1:40-50).

After the miraculous draught of fish on the Sea of Galilee, Peter received his definitive call and left wife, family, and occupation to take his place as leader of the Twelve. Thereafter we find him continually at Jesus' side, whether it be as spokesman of the apostolic college (John 6:68; Matt. 16:16), or as one specially favored (e.g., at the restoration to life of Jairus' daughter, at the transfiguration, during the agony in the garden). His sanguine temperament often led him into hasty, unpremeditated words and actions; his denial of Jesus during the passion was a salutary lesson. It accentuated a weakness in his character and made him humble.

After the ascension, Peter always took the leading role, exercising the office of chief shepherd that Christ had entrusted to him. He delivered the first sermon on Pentecost and received the first Gentiles into the Church (Cornelius; Acts 10:1). Paul went to Jerusalem "to see Peter." After his miraculous deliverance from prison (Easter, 42 A.D.), Peter "went to a different place," most probably to Rome. Details now become scanty; we hear of his presence at the Council of Jerusalem (Acts 15:1), and of his journey to Antioch (Gal. 2:11).

It is certain that Peter labored in Rome as an apostle, that he was the city's first bishop, and that he died there as a martyr, bound to a cross (67 A.D.). According to tradition he also was the first bishop of Antioch. He is the author of two letters, the first Christian encyclicals. His burial place is Christendom's most famous shrine, an edifice around whose dome are inscribed the words: Tu es Petrus, et super hanc petram aedificabo ecclesiam meam.

http://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2013-06-29