St. Peter and St. Paul (1st c.) were the foremost Apostles of Jesus Christ; St. Peter was the leader of the Twelve, while St. Paul followed Christ after His ascension into heaven. Together the two saints are the founders of the Church in Rome through their apostolic preaching, ministry, and martyrdom in that city. They are the solid rock on which the foundation of the Catholic Church is built, and they will forever remain her protectors and guides. To them Rome owes her true greatness, for it was under God's providential guidance that they transformed the capital of the Roman Empire into the heart of the Church, with the mission to radiate the Gospel of Our Lord Jesus Christ throughout the world. Both saints were martyred in close proximity to one another; Peter first, then Paul, though some traditions claim they were killed on the same day. St. Peter was crucified upside down and buried on the hill of the Vatican where St. Peter's Basilica now stands. St. Paul was beheaded on the via Ostia and buried where the Basilica of St. Paul Outside the Walls now stands. St. Peter and St. Paul are the patron saints of Rome and they share a feast day on June 29, a tradition going back to the earliest centuries of the Church.