◄ VATICAN CITY STATE

Vatican City is a landlocked ecclesiastical state, seat of the Roman Catholic Church, and an enclave in Rome, situated on the west bank of the Tiber River. Vatican City is the world’s smallest fully independent nation-state. Its medieval and Renaissance walls form its boundaries except on the southeast at St. Peter’s Square (Piazza San Pietro). Of the six entrances, only three—the piazza, the Arco delle Campane (Arch of the Bells) in the facade of  St. Peter’s Basilica, and the entrance to the Vatican Museums and Galleries in the north wall—are open to the public. The most imposing building is St. Peter’s Basilica, built during the 4th century and rebuilt during the 16th century. Erected over the tomb of St. Peter the Apostle, it is the second largest religious building (after Yamoussoukro Basilica) in Christendom.  

 
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Holy See (Vatican City)

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During the unification of Italy in the mid-19th century, the Papal States under Pius IX resisted incorporation into the new nation, even as almost all the other Italian countries joined it; Camillo Cavour's dream of proclaiming the Kingdom of Italy from the steps of St. Peter's Basilica did not come to pass. The nascent Kingdom of Italy invaded and occupied Romagna (the eastern portion of the Papal States) in 1860, leaving only Latium in the pope's domains. Latium, including Rome itself, was occupied and annexed in 1870. For the following sixty years, relations between the Papacy and the Italian government were hostile, and the sovereign rights of the pope became known as the Roman Question

11 February 1929, the Lateran Treaty was signed, one component of the Lateran Pacts between the Kingdom of Italy under King Victor Emmanuel III (with his Prime Minister, Fascist Italian Duce Benito Mussolini) and the Holy See under Pope Pius XI to settle the long-standing Roman question