Ertugrul Osman was a descendant of Osman I, the Anatolian ruler who in 1299 established the kingdom that eventually controlled parts of Europe, Africa and the Middle East. Mr. Osman would have eventually become the Sultan but for the establishment of the Turkish Republic, proclaimed in 1923.
Born in 1912, Mr. Osman was the last surviving grandson of an Ottoman emperor; his grandfather, Abdul Hamid II, ruled from 1876 to 1909. In 1924, the royal family was expelled by Ataturk, the founder of the Turkish Republic. “The men had one day to leave,” Mr. Osman said. “The women were given a week.”
http://www.nytimes.com/2009/09/24/nyregion/24osman.html?_r=0