Pope Pius XI (Italian: Pio XI; born Ambrogio Damiano Achille Ratti, Italian: [amˈbrɔːdʒo daˈmjaːno aˈkille ˈratti]; 31 May 1857 – 10 February 1939) was head of the Catholic Church from 6 February 1922 until his death in February 1939. He was also the first sovereign of Vatican City upon its creation on 11 February 1929.