Peter of Galille was one of Jesus Christ's disciples in the 1st century. (PROSE: Byzantium!)
According to Johann Eck, all Popes derived their authority from their predecessors, right back to Saint Peter. The First Doctor thought he was a "very interesting man" and "a powerful speaker". (PROSE: The Price of Conviction)
In the 46th century, the Pope was a clone of Saint Peter; he had been grown from one of his fingernails. (PROSE: Paydirt)