 In the late Middle Ages, from 1100 to 1500, the European slave-trade continued, though with a shift from being centered among the Western Mediterranean Islamic nations to the Eastern Christian and Muslim states.The city-states of Venice and Genoa controlled the Eastern Mediterranean from the 12th century and the Black Sea from the 13th century.They sold both Slavic and Baltic slaves, as well as Georgians, Turks, and other ethnic groups of the Black Sea and Caucasus.