The Radetzky class was a group of three semi-dreadnought battleships built for the Austro-Hungarian Navy between 1907 and 1910. All ships were built by the STT shipyard in Trieste. They were the last pre-dreadnoughts built by the Austro-Hungarians, and the penultimate class of any type of Austro-Hungarian battleship completed. The class comprised three ships: Radetzky, Erzherzog Franz Ferdinand, and Zrínyi. They were armed with four 30.5 centimeter (12 inch) guns in two twin turrets and eight 24 cm (9.4 in) guns in four twin turrets; the heavy secondary guns set the Radetzky-class ships apart from other pre-dreadnought type battleships.