Peters symbol was two keys in the shape of an X.
Christianity. Following God.
Because that is where St. Peter the Apostle was martyred.
Only one - Simon Peter, apostle of Jesus.
There has only been one pope named Peter - Simon Peter the Apostle.
The bishop or apostle wears the ring on the ring finger of the right hand, as a symbol of their marriage to the Church.
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.
Apostle Mark's symbol is the lion. You can read more about it on the link below since I am a protestant theologian not a Catholic one.
As per the Patron Saint Index, Matthias the Apostle is represented by a lance or a spear.
The New Testament does not provide the name of the Apostle Peter's daughter. However, some early Christian traditions and apocryphal texts, such as the "Acts of Peter," mention a daughter named Petronilla. This name is more commonly associated with a saint venerated in the early church, but it is not definitively linked to the biblical account of Peter's family.
The Apostle Peter's last name is not known in the way modern surnames are used today. He is often referred to as Simon Peter, with "Simon" being his given name and "Peter" being a name given to him by Jesus, meaning "rock." In biblical texts, he is typically identified by these names rather than a family surname.