Simon bar Jonah was a fisherman on the Sea of Galilee with his brother Andrew. His brother brought him to Jesus, who renamed him Cephas (Aramaic) — in Greek, Petros, 'the Rock' — and said: 'You are Peter, and on this rock I will build my Church, and the gates of hell will not prevail against it' (Matthew 16:18).
Throughout the Gospels he is foremost among the Twelve: he confesses Christ as the Son of the living God at Caesarea Philippi; he walks on water at Christ's command and begins to sink; he denies Christ three times in the night of the Passion, weeps bitterly, and is reconciled by the Sea of Galilee with the threefold question 'Do you love me?' At Pentecost he preaches the first Christian sermon (Acts 2) and baptises three thousand.
He led the early Jerusalem Church, took the Gospel to the Gentiles in the household of Cornelius (Acts 10), and presided at the first Council of Jerusalem (Acts 15). Eusebius, Origen, Tertullian, and Irenaeus all attest that he was bishop of Rome and was martyred there under Nero. Tradition holds that, judging himself unworthy to die in the same manner as Christ, he asked to be crucified head downward.

