High Quality Content by WIKIPEDIA articles! The Papal Archbasilica of St. John Lateran (Italian: Arcibasilica Papale di San Giovanni in Laterano), commonly known as St. John Lateran`s Archbasilica and St. John Lateran`s Basilica, is the cathedral of the Diocese of Rome and the official ecclesiastical seat of the Bishop of Rome, who is the Pope. 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. John the Baptist and the Evangelist at the Lateran, and in Italian as Arcibasilica del Santissimo Salvatore e Santi Giovanni Battista ed Evangelista in Laterano.