 Complete the following phrase:  The Ottoman Empire accepted many corsairs as their agents, who made Algiers their base, including Khair al-Din Arabic name and his brother Aruj both known for red beards and called Barbarossa, and Uluj Ali. In 1551 the corsair Dragut was installed in Tripoli; he entered Kairouan in 1558. Then in 1569 Uluj Ali, advancing from Algiers, seized Tunis. After the Christian naval victory at 