 Owing to its location, Klis Fortress was an important defensive position during the Ottoman conquest of the Balkans. The fortress stands along the route by which the Ottomans could penetrate the mountain barrier separating the coastal lowlands from around Split, from Turkish-held Bosnia. The Croat feudal lord Petar Kružić gathered together a garrison composed of Croat refugees, who used the base at Klis both to hold the Turks at bay, and to engage in marauding and piracy against coastal shipping. Although nominally accepting the sovereignty of the Habsburg king Ferdinand who had obtained the Croatian crown in 1527, Kružić and his freebooting Uskoks were a law unto themselves.
