An independent papal state in Rome, the seat of the Roman Catholic Church. Following the Risorgimento, the Papal States (the modern Italian provinces of Lazio, Umbria, Le Marche, and parts of Emilia-Romagna) became incorporated into a unified Italy in 1870 while, by the Law of Guarantees (1871), the Vatican was granted extraterritoriality. The temporal power of the pope was suspended until the Lateran Treaty of 1929, signed between Pope Pius XI and Mussolini, which recognized the full and independent sovereignty of the Holy See in the City of the Vatican. It covers an area of 44 hectares (109 acres) and has its own police force, diplomatic service, postal service, railway station, coinage, and radio station. It has about 850 inhabitants.