Grand admiral is a historic naval rank, the highest rank in the several European navies that used it. It is best known for its use in Germany as Großadmiral. A comparable rank in modern navies is that of admiral of the fleet.
Image: Prince Henry of Prussia (1862–1929), brother of Kaiser Wilhelm II
Image: Postcard Kaiser Wilhelm II of Germany circa 1910
Image: Edward VII of the United Kingdom
Image: Koester, Admiral Hans von, Agence Rol, BNF Gallica
Anton Johann Haus was an Austrian naval officer. Despite his German surname, he was born to a Slovenian-speaking family in Tolmein. Haus was fleet commander of the Austro-Hungarian Navy in World War I and was the Navy's Grand Admiral from 1916 until his death.
Anton Haus in 1914