Basilica of St. John Lateran - AbsoluteAstronomy.com

The Papal Archbasilica of St. John Lateran , commonly known as St. John Lateran's Archbasilica and St. John Lateran's Basilica, is the cathedral

Cathedral

A cathedral is a Christian church that contains the seat of a bishop...

of the Diocese of Rome

Diocese of Rome

The Diocese of Rome is a diocese of the Catholic Church in Rome, Italy. The bishop of Rome is the Pope, who is the Supreme Pontiff and leader of the Catholic Church...

and the official ecclesiastical seat of the Bishop of Rome, who is the Pope

Pope

The Pope is the Bishop of Rome, a position that makes him the leader of the worldwide Catholic Church . In the Catholic Church, the Pope is regarded as the successor of Saint Peter, the Apostle...

. The official name, in Latin, is Archibasilica Sanctissimi Salvatoris et Sanctorum Iohannes Baptista et Evangelista in Laterano, which translates in English as Archbasilica of the Most Holy Saviour and Ss.