Coordinate: 41° 54′ 8″ N, 12° 27′ 19″ E
Vatican City, or Vatican City State, in Italian officially Stato della Città del Vatican, is a landlocked sovereign city-state whose territory consists of a walled enclave within the city of Rome. It has an area of approximately 44 hectares, and a population of just over 800. This makes Vatican City the smallest independent state in the world by both area and population. Vatican City State was established in 1929 by the Lateran Treaty, signed by Cardinal Secretary of State Pietro Gasparri, on behalf of Pope Pius XI and by Prime Minister and Head of Government Benito Mussolini on behalf of King Victor Emmanuel III of Italy.
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Vatican City State is distinct from the Holy See, which dates back to early Christianity and is the main episcopal see of 1.2 billion Latin and Eastern Catholic adherents around the globe. Ordinances of Vatican City are published in Italian; official documents of the Holy See are issued mainly in Latin. The two entities have distinct passports: the Holy See, not being a country, issues only diplomatic and service passports, whereas Vatican City State issues normal passports. In each case very few passports are issued. The Lateran Treaty in 1929, which brought the city-state into existence, spoke of it as a new creation (Preamble and Article III), not as a vestige of the much larger Papal States (756-1870) that had previously encompassed much of central Italy.
Most of this territory was absorbed into the Kingdom of Italy in 1860, and the final portion, namely the city of Rome with Lazio, ten years later, in 1870. Vatican City is an ecclesiastical or sacerdotal-monarchical state, ruled by the Bishop of Rome-the Pope. The highest state functionaries are all Catholic clergymen of various national origins. It is the sovereign territory of the Holy See (Sancta Sedes) and the location of the Pope’s residence, referred to as the Apostolic Palace. The Popes have generally resided in the area that in 1929 became Vatican City since the return from Avignon in 1377, but have also at times resided in the Quirinal Palace in Rome and elsewhere. Previously, they resided in the Lateran Palace on the Caelian Hill on the far side of Rome from the Vatican. Emperor Constantine gave this site to Pope Miltiades in 313. The signing of the agreements that established the new state took place in the latter building, giving rise to the name of Lateran Pacts, by which they are known.