Christianity. Following God.
Because that is where St. Peter the Apostle was martyred.
Peters symbol was two keys in the shape of an X.
Only one - Simon Peter, apostle of Jesus.
There has only been one pope named Peter - Simon Peter the Apostle.
The Apostle Paul.
Christianity
I believe that there is only one Peter in the Bible, the Apostle Peter.
No one actually knows for certain what happened to the wife of the Apostle Peter. A wife is mentioned in 1 Corinthians 9:5 but nothing else known.
Nobody is buried in the altar at Saint Peter's, however, the altar is built directly over the tomb of St. Peter, the first apostle.
The Apostle Andrew brought the religion to Russia and Vladimir the Great established it as official in 988.
The Catholic religion originated in Jerusalem, it was the Church that Our Blessed Lord founded on His apostle, Peter, see St. Matthew's Gospel 16:17-19.
He started of thinking Christ as an enemy and finished becoming one of the founders of the Christian religion.