Lateran treaties

The Lateran Treaty (Italian: Patti Lateranensi; Latin: Pacta Lateranensia) was one of the Lateran Pacts of 1929 or Lateran Accords, agreements made in 1929 between the Kingdom of Italy and the Holy See, settling the "Roman Question". They are named after the Lateran Palace, where they were signed on February 11, 1929. The Italian parliament ratified them on June 7, 1929. Italy was then under a Fascist government, but the succeeding democratic governments have all upheld the treaty. It recognized the Vatican as an independent state, with Prime Minister Benito Mussolini agreeing to give the church financial refund. In 1947, the Lateran Pacts were incorporated into the democratic Constitution of Italy.

The Lateran Pacts are often presented as three treaties: a 27-article treaty of conciliation, a 3-article financial convention, and a 45-article concordat. However, the website of the Holy See presents the pacts as two, making the financial convention an annex of the treaty of conciliation. In this presentation, the pacts consisted of two documents, the first of which had four annexes:

During the unification of Italy in the mid-19th century, the Papal States resisted incorporation into the new nation, even as all the other Italian countries, except for San Marino, 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 status of the Pope became known as the "Roman Question".

...
Wikipedia