Pietro Gasparri, who in 1929 signed the Lateran Pacts, was his uncle.
In 1929, Mussolini signed a Lateran Pact with the Roman Catholic Church.
The Italian occupation forced Pius IX to his palace where he declared himself a prisoner in the Vatican until the Lateran Pacts of 1929.
After the Lateran Pacts were signed in 1929, the Popes regularly visited parts of Rome outside the Vatican.
In 1947, the Lateran Pacts were incorporated into the democratic Constitution of Italy.
Angelini was not prosecuted, due to the Vatican's extraterritorial privileges granted by the Lateran Pacts.
In opposition to the dominant line in his own party, he voted for the including of the Lateran Pacts in the Italian Constitution.
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.
The State of the Vatican City, created in 1929 by the Lateran Pacts, provides the Holy See with a temporal jurisdiction and independence within a small territory.
In the following decades, nevertheless, various accords - ending up in the Lateran Pacts - saw the national churches' assets returned to the Roman Catholic Church.