Saint Peter's tomb is a site under St. Peter's Basilica that includes several graves and a structure said by Vatican authorities to have been built to memorialize the location of Saint Peter's grave. St. Peter's tomb is alleged near the west end of a complex of mausoleums, the Vatican Necropolis, that date between about AD 130 and AD 300. The complex was partially torn down and filled with earth to provide a foundation for the building of the first St. Peter's Basilica during the reign of Constantine I in about AD 330. Though many bones have been found at the site of the 2nd-century shrine, as the result of two campaigns of archaeological excavation, Pope Pius XII stated in December 1950 that none could be confirmed to be Saint Peter's with absolute certainty. Following the discovery of bones that had been transferred from a second tomb under the monument, on June 26, 1968, Pope Paul VI said that the relics of Saint Peter had been identified in a manner considered convincing. Only circumstantial evidence was provided to support the claim. The grave allegedly lies at the foot of the aedicula beneath the floor. The remains of four individuals and several farm animals were found in this grave. In 1953, after the initial archeological efforts had been completed, another set of bones were found that were said to have been removed without the archeologists' knowledge from a niche (loculus) in the north side of a graffiti wall that abuts the red wall on the right of the aedicula. Subsequent testing indicated that these were the bones of a 60- to 70-year-old man. Margherita Guarducci argued that these were the remains of Saint Peter and that they had been moved into a niche in the graffiti wall from the grave under the aedicula "at the time of Constantine, after the peace of the church" (313). Antonio Ferrua, the archaeologist who headed the excavation that uncovered what the Catholic Church says is Saint Peter's Tomb, said that he was not convinced that the bones that were found were those of Saint Peter. Death of Peter at Vatican Hill The earliest reference to Saint Peter's death is in a letter of Clement, bishop of Rome, to the Corinthians (1 Clement, a.k.a. Letter to the Corinthians, written AD). The historian Eusebius, a contemporary of Constantine, wrote that Peter "came to Rome, and was crucified with