The Cathedral of the Most Holy Savior and of Saints John the Baptist and the Evangelist in the Lateran (Santissimo Salvatore e Santi Giovanni Battista ed Evangelista in Laterano in Italian) – also known as the Papal Archbasilica of Saint John Lateran, Saint John Lateran, or the Lateran Basilica – is the cathedral church of the Diocese of Rome in the city of Rome and serves as the seat of the Roman Pontiff.
It is the oldest and highest ranking of the four papal major basilicas, holding the unique title of "archbasilica." It is the oldest public church in the city of Rome, and the oldest basilica of the Western world. It houses the cathedra of the Roman bishop, and has the title of ecumenical mother church of the Catholic faithful.
The current archpriest is Angelo De Donatis, Vicar General for the Diocese of Rome. The President of the French Republic, currently Emmanuel Macron, is ex officio the "first and only honorary canon" of the archbasilica, a title that the heads of state of France have possessed since King Henry IV.
The large Latin inscription on the façade reads: Clemens XII Pont Max Anno V Christo Salvatori In Hon SS Ioan Bapt et Evang. This abbreviated inscription translates as: "Pope Clement XII, in the fifth year [of his Pontificate, dedicated this building] to Christ the Savior, in honor of Saints John the Baptist and [John] the Evangelist." The inscription indicates, with its full title, that the archbasilica was originally dedicated to Christ the Savior and, centuries later, co-dedicated to Saint John the Baptist and Saint John the Evangelist. As the Cathedral of the Pope as Bishop of Rome, it ranks superior to all other churches of the Roman Catholic Church, including Saint Peter's Basilica.
The archbasilica is sited in the City of Rome. It is outside Vatican City, which is approximately 2.5 miles (4 kilometers) to its northwest, although the archbasilica and its adjoining edifices have extraterritorial status from Italy as one of the properties of the Holy See, pursuant to the Lateran Treaty of 1929.
The historic center of Rome is listed by UNESCO as a World Heritage Site.
Information from:
en.wikipedia.org/wiki/Archbasilica_of_Saint_John_Lateran
en.wikipedia.org/wiki/Rome 