who was the emperor of the ottoman empire
1 â. Acquired the control of the eastern part of the Anatolian territory as the Co-Sultan just after the defeat of the Battle of Ankara on 20 July 1402. 2  Defeated Ä°sa Ãelebi in the battle of Ulubat in 1405. 3  Became the sole ruler of the Anatolian territory of the Ottoman Empire upon Ä°saâs death in 1406.