The Lateran Palace, formally the Apostolic Palace of the Lateran, is an ancient palace of the Roman Empire and later the main papal residence in southeast Rome.
Located on St. John's Square in Lateran on the Caelian Hill, the palace is adjacent to the Archbasilica of Saint John Lateran, the cathedral church of Rome. From the fourth century, the palace was the principal residence of the popes, and continued so for about a thousand years until the Apostolic Residence ultimately moved to the Vatican. The palace is now used by the Vatican Historical Museum, which illustrates the history of the Papal States. The palace also houses the offices of the Vicariate of Rome, as well as the residential apartments of the Cardinal Vicar, the pope's delegate for the daily administration of the diocese. Until 1970, the palace was also home to the important collections of the Lateran Museum, now dispersed among other parts of the Vatican Museums.
Wikipedia https://en.wikipedia.org/wiki/Lateran_Palace
Address 6A Piazza di San Giovanni in Laterano, Roma 00184, Italy
Coordinates 41°53'11.671" N 12°30'20.596" E