The Vatican Hill reference article from the English Wikipedia on 24-Apr-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Vatican Hill

Long before the founding of Christianity, the Vatican Hill is one of the hills on the side of the Tiber opposite the traditional seven hills of Rome has been called the Vatican Hill (in Latin, Vaticanus Mons). It may have been the site of an Etruscan town called Vaticum. The Vatican Hill is not part of the famous seven hills of Rome.

It has for some centuries been the locus of the headquarters of the Holy See and, since 1929, that of the State of the Vatican City.