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 church 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.
It is the oldest and ranks first among the four Papal Basilicas or major basilicas of Rome (having the cathedra of the Bishop of Rome). It claims the title of ecumenical mother church among Roman Catholics. The current archpriest of St. John Lateran is Agostino Vallini, Cardinal Vicar General for the Diocese of Rome. The President of the French Republic, currently Nicolas Sarkozy, is ex officio the "first and only honorary canon" of the basilica, a title inherited from the Kings of France, who have held it since Henry IV of France.