Beli Orao (Serbo-Croatian for 'White Eagle') was a royal yacht built in 1938–39 for the Yugoslav Royal Navy, which intended her to serve as a patrol boat, escort, or guard ship in wartime. Upon completion, she was pressed into service as the admiralty yacht – used by senior admirals for transport and to review fleet exercises. She was captured in April 1941 by the Italians during the World War II Axis invasion of Yugoslavia. The Regia Marina (Italian Royal Navy) replaced her guns and used her as a gunboat for harbour protection and coastal escort duties, briefly as Alba then Zagabria. She was then used to train anti-submarine warfare specialists from the naval base at La Spezia.