One of the most feared of all the Barbary pirates was Kheir-ed-Din, of the notorious Barbarossa brothers. After his brother Aruj lost his arm in an attack on a Spanish fort, the brothers began to concentrate their attacks more and more against the Spaniards, and especially against their settlements in North Africa. In 1530 Kheir-ed-Din became the Sultan of Algiers. When he died he was regarded with admiration by both his friends and his sworn enemies.