Following the Battle of Mohács, the Ottomans expanded their possessions in Slavonia by seizing Đakovo in 1536 and Požega in 1537. In 1540, as Osijek came under Ottoman control, regular administration in Slavonia was introduced by the establishment of the Sanjak of Pojega. Ottoman control in Slavonia expanded and by 1552 conquest was complete. During the Great Turkish War (1667–1698), the Ottomans abandoned the region in 1687 and finally liberated in 1689 when Luka Ibrišimović led a revolt in Požega. Subsequently, as Požega County was restored in the region, Osijek became the administrative and military centre of the newly formed Kingdom of Slavonia, unseating Požega.