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It occupies a "unique position" as one of the holiest sites and as "the greatest of all churches of Christendom". In Catholic tradition, it is the burial site of its namesake Saint Peter, who was one of the twelve apostles of Jesus and, according to tradition, was the first Bishop of Antioch, and later first Bishop of Rome and therefore first in the line of the papal succession.

St. Peter's and the Vatican, from the Tiber Banks

It occupies a "unique position" as one of the holiest sites and as "the greatest of all churches of…