The Holy See dates back to early Christianity, and is the primateepiscopal see of the Catholic Church, with 1.3 billion Catholic Christians around the world distributed in the Latin Church and 23 Eastern Catholic Churches. The independent Vatican City-state, on the other hand, came into existence on 11 February 1929 by the Lateran Treaty between the Holy See and Italy, which spoke of it as a new creation, not as a vestige of the much larger Papal States (756–1870), which had previously encompassed much of central Italy.
The name Vatican City was first used in the Lateran Treaty, signed on 11 February 1929, which established the modern city-state named after Vatican Hill, the geographic location of the state. "Vatican" is derived from the name of an Etruscan settlement, Vatica or Vaticum located in the general area the Romans called Ager Vaticanus, "Vatican territory".
The official Italian name of the city is Città del Vaticano or, more formally, Stato della Città del Vaticano, meaning "Vatican City State". Although the Holy See (which is distinct from the Vatican City) and the Catholic Church use Ecclesiastical Latin in official documents, the Vatican City uses Italian. The Latin name is Status Civitatis Vaticanæ; this is used in official documents by the Holy See, the Church and the Pope.