Which empire did the privateer and admiral Barbarossa fight for?
Hayreddin Barbarossa was an Ottoman admiral of the fleet, whose naval victories secured Ottoman dominance over the Mediterranean during the mid 16th century. He became known as "Barbarossa" ("Redbeard" in Italian) in Europe, a name he inherited from his elder brother (also a capitain) Oruç Reis, who indeed had a red beard (unlike Hayreddin himself).