 Slavery in Europe, mainly around the Mediterranean, continued, and was increased by the increased size of Mediterranean navies to combat the powerful Ottoman navy.The main type of naval ship in the Mediterranean, unlike the Atlantic and Northern seas, was the galley, rowed by galley-slaves; use of the galley only declines from about 1600.The navy of the Papal States was no different from that of Venice, France, Genoa and other naval powers.