Dündar Ali Osman, also known as Dündar Ali Osman Osmanoğlu, with a surname as required by the Republic of Turkey, or known by the Ottoman imperial name as Şehzade Dündar Ali Osman Osmanoğlu Efendi, was the 45th Head of the House of Osman, which ruled the Ottoman Empire from 1299 until the abolition of the Sultanate in 1922. Wikipedia