The first and most distinguished of these corsairs to take naval service under Solyman was Kheireddin, better known in history as Barbarossa. He was one of four brothers, of Greek descent, born in Mytilene, three of whom in early life took to piracy as a profession, under the pretence of legitimate commerce at sea. Two of them eventually lost their lives in the venture, but the third survived, prospered, and made money. He collected a squadron under his command and became the terror of the whole Mediterranean, capturing merchant vessels and devastating the coasts in all directions. Gathering strength in number of ships and men, he made war on his own account. He attacked Algiers and made himself master of that city and its surrounding district. But finding himself unequal to the task of maintaining an independent rule there, he recognized the supremacy of the Sultan of Turkey. He carried on his ships seventy thousand fugitive Moors from Andalusia, in Spain, and settled them at Algiers. Later, he was employed by Solyman in an attack on Tunis, which was then under the rule of Muley-Hasan, the twenty-second representative of the dynasty of Boni Hafss—a degenerate reprobate, who had murdered all but one of his forty-four brothers on his accession to the throne, and who spent his energies in recruiting a harem of four hundred good-looking lads. On the pretext of putting an end to this infamy, Barbarossa attacked the city of Tunis, and had no difficulty in getting possession of it and expelling the contemptible Sultan. He did not, however, remain many months in possession of it. Muley-Hasan appealed to the Emperor Charles for aid. The Emperor, in personal command of a fleet of five hundred vessels and an army of thirty thousand men, attacked and defeated Barbarossa in a battle before the walls of Tunis, captured his vessels lying there, and drove him into the interior of the country. Although he had come there at the invitation of the Sultan of Tunis, and the inhabitants of the city had given no assistance to Barbarossa in defending it against the Spanish attack, the Emperor allowed his soldiers to sack it after the capture. A scene of almost incredible cruelty and destruction took place. Thirty thousand of the innocent inhabitants were massacred, and ten thousand were sold into captivity. The mosques and all the principal buildings were burnt and destroyed. No worse deed was ever perpetrated by any victorious Moslem army in that age. It resulted that Tunis, for a time, was rescued from Barbarossa and from Ottoman rule. Muley-Hasan was reinstated there on terms of close dependence on Spain. It was not till 1574 that Tunis finally fell into the hands of the Turks.