The Basilica of St. John Lateran
The Cathedral of the Most Holy Savior and of Saints John the Baptist and the Evangelist in the Lateran, better known as the Basilica of San Giovanni in Laterano, is, by definition, the "mother of all the churches in the world" and represents the ideal trait d'union between the pagan and the Christian era.
Initially born as a building for public meetings and for the administration of justice, it was transformed into a majestic ecclesiastical structure, suitable for hosting a large number of faithful, with the spread of the new cult.
Standing near Mount Celio, the Basilica was built on the same site as the one erected by Constantine, around 314, on land formerly owned by the noble Lateran family, from which the whole area takes its name.