Introduction to the Vatican

The territory on the right bank of the Tiber between Monte Mario and Gianicolo (Janiculum) was known to antiquity as the Ager Vaticanus, and, owing to its marshy character, the low-lying portion of this district enjoyed an ill repute. The origin of the name Vaticanus is uncertain; some claim that the name comes from a vanished Etruscan town called Vaticum. This district did not belong to ancient Rome, nor was it included within the city walls built by Emperor Aurelian. In the imperial gardens situated in this section was the Circus of Nero. At the foot of the Vatican Hill lay the ancient Basilica of St. Peter. By extensive purchases of land the medieval popes acquired possession of the whole hill, thus preparing the way for building activity. Communication with the city was established by the Pons Ælius, which led directly to the mausoleum of Hadrian. Between 848 and 852 Leo IV surrounded the whole settlement with a wall, which included it within the city boundaries. Until the pontificate of Sixtus V this section of Rome remained a private papal possession and was entrusted to a special administration. Sixtus, however, placed it under the jurisdiction of the urban authorities as the fourteenth region.