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SMS Tegetthoff class dreadnought battleships

The Tegetthoff class (sometimes erroneously named the Viribus Unitis class) was the sole class of dreadnought battleships built for the Austro-Hungarian Navy. Four ships were built, Viribus Unitis, Tegetthoff, Prinz Eugen, and Szent István. Three of the four were built in Trieste; Szent István was built in Fiume, so that both parts of the Dual Monarchy would participate in the construction of the ships. The smaller size of the shipyards in Fiume meant that Szent István was built three years after her sisters, with slightly different characteristics.
The first three ships, Viribus Unitis, Tegetthoff, and Prinz Eugen were joined by their sister in 1915, when they bombarded Italian installations at Ancona. The Tegetthoffs attempted to sortie through the Otranto Barrage with the support of lighter ships in 1918, but failed after Szent István was by chance sunk by a small motor torpedo-boat. In 1918, Viribus Unitis was transferred to Yugoslavia, and sunk early in the morning the next day by Italian frogmen. Tegetthoff and Prinz Eugen were surrendered to Italy and France, respectively.