Papal Archbasilica of St. John Lateran

Arcibasilica Papale del Santissimo Salvatore e Santi Giovanni Battista ed Evangelista in Laterano

As the cathedral of the Diocese of Rome, it is the official ecclesiastical seat of the Pope and ranks as the oldest and first among the four major papal basilicas. It holds the unique title of 'Mother and Head of all Churches in the City and the World.'