Navy Day in Italy, also known as Festa della Marina, is observed every June 10. This day commemorates a significant victory of the Royal Navy during World War I, specifically the sinking of the Austro-Hungarian dreadnought SMS Szent István in 1918. The Royal Navy, founded in 1861 following the unification of Italy, originally celebrated Navy Day on December 4, the feast day of Saint Barbara, the patron saint of naval forces. However, in 1963, the date was officially changed to June 10. Although it is not a public holiday, it holds importance for the Italian Navy (Marina Militare) and is marked by various ceremonies and events honoring naval personnel and history. The celebration has evolved over the years, particularly after its revival in 1950, and reflects Italy's naval heritage and achievements.