Tripoli was the only city of size in Ottoman Libya (then known as Tripolitania Eyalet) at the end of the 17th century and had a population of about 30,000. The bulk of its residents were Moors, as city-dwelling Arabs were then known. Several hundred Turks and renegades formed a governing elite, a large portion of which were "kouloughlis" (lit. sons of servants—offspring of Turkish soldiers and Arab women); they identified with local interests and were respected by locals. Jews and Moriscos were active as merchants and craftsmen and a small number of European traders also frequented the city. European slaves and large numbers of enslaved blacks transported from Sudan were also a feature of everyday life in Tripoli. In 1551, Turgut Reis enslaved almost the entire population of the Maltese island of Gozo, some 6,300 people, sending them to Libya. The most pronounced slavery activity involved the enslavement of black Africans who were brought via trans-Saharan trade routes. Even though the slave trade was officially abolished in Tripoli in 1853, in practice it continued until the 1890s.