Abdul Hamid II
Constitutionalism was established during the reign Abdul Hamid II, who thus became the empire's last absolute ruler and its reluctant first constitutional monarch. 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 2021, the head of the House of Osman has been Harun Osman, a great-grandson of Abdul Hamid II.