Saint Peter's Square is a large plaza located directly in front of St. Peter's Basilica in Vatican City, the papal enclave inside Rome, directly west of the neighborhood of Borgo. Both the square and the basilica are named after Saint Peter, an apostle of Jesus considered by Catholics to be the first Pope.
The Papal Basilica of Saint Peter is a church built in the Renaissance style located in Vatican City, the papal enclave that is within the city of Rome, Italy. It was initially planned by Pope Nicholas V and then Pope Julius II to replace the aging Old St. Peter's Basilica, which was built in the fourth century by Roman emperor Constantine the Great. Construction of the present basilica began on 18 April 1506 and was completed on 18 November 1626.