Hayreddin Barbarossa, also known as Hzr Hayrettin Pasha and simply Hzr Reis, was an Ottoman corsair and subsequently admiral of the Ottoman Navy. During the mid-16th century, Barbarossa\s naval successes established Ottoman supremacy over the Mediterranean. Khizr, who was born on the Greek island of Lesbos, began his naval career as a corsair under his elder brother, Oruç Reis.