The Tegetthoff-class (sometimes erroneously named the Viribus Unitis-class) was the sole class of dreadnought battleship built for the Austro-Hungarian Navy. Four ships were built, Viribus Unitis, Tegetthoff, Prinz Eugen and Szent István. Three of the four were laid down in Trieste, with Szent Istvan being built at Fiume, to incorporate both parts of the dual monarchy into the construction of the ships. The smaller size of the Fiume shipyards meant that Szent István was built three years after her sisters, with slightly different characteristics.