The Littorio class, also known as the Vittorio Veneto class, was a class of battleship of the Regia Marina, the Italian navy. The class was composed of four ships: Littorio, Vittorio Veneto, Roma, and Impero. Only the first three ships of the class were completed, however. Built between 1934 and 1942, they were the most modern battleships used by Italy during World War II. The Littorio-class ships were developed in response to the French Dunkerque-class battleships, and were armed with 381-millimeter (15.0 in) guns and had a top speed of 30 knots (56 km/h; 35 mph). The design was considered by the Spanish Navy, but the outbreak of World War II interrupted construction plans.