title: List of sultans of the Ottoman Empire
context: Constitutionalism was only established during the reign Abdul Hamid II, who thus became the empire's last absolute ruler and its reluctant first constitutional monarch.[12] Although Abdul Hamid II abolished the parliament and the constitution to return to personal rule in 1878, he was again forced in 1908 to reinstall constitutionalism and was deposed. Since 2017, the head of the House of Osman and pretender to the defunct Ottoman throne has been Dündar Ali Osman, a great-grandson of Abdulhamid II.[13]
question: Who was the last leader of the Ottoman Empire?
answers.text: Abdul Hamid II