The Archbasilica of Saint John Lateran (Basilica di San Giovanni in Laterano). Major Papal. Lateran Basilica or Saint John Lateran. Rome, ItalyROME, ITALY – 6 APRIL 2016: Rome, Italy. The Papal cathedral, the presence of which renders the Archbasilica St. John Lateran, San Giovanni in Laterano, the cathedral of Rome, is located in its apse.