Barbarossa, the name given to two renegade Greek corsairs, and supposed to be a corruption of Baba-rais, father captain. I. Aradj, Horush, or Horuk, born at Mitylene (Lesbos) about 1474, executed in 1518. He acquired fame in the service of Egypt, Turkey, and Tunis, and with his brother became the terror of the Mediterranean. Invited by the emir of the Metidja, Selim Eutemi, in 1516, to aid him against the Spaniards, he made himself master of Algiers, Tenez, and Tlemcen, and murdered the emir, but was defeated by the troops of Charles V., besieged in Tlemcen, captured on his flight from that city, and put to death. II. Khair-ed-Din, brother and successor of the preceding, born about 1476, died in Constantinople in 1546. After his brother's death he obtained the assistance of the sultan Selim I. in recovering Algiers. Solyman I. putting him in command of his fleet, he fortified Algiers, and conquered Tunis and other territories for the Turks. After Charles V. retook Tunis in 1535, Barbarossa preyed upon the coast of Italy, defeated Dona in the gulf of Ambra-cia, captured Castel Nuovo (1539), defeated a Christian squadron off Candia, threatened Dorm at Genoa, joined Francis I. against Charles V., aided the French in taking Nice (1543), and made a triumphant entry into Constantinople with many thousand prisoners.