Born in Istanbul in 1912, Osman spent most of his years living modestly in New York.
ERTUGRUL Osman, who might have ruled the Ottoman Empire from a palace in Istanbul but instead spent most of his life in an apartment in New York, has died of kidney failure while on a visit to Turkey. He was 97.
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.
The younger Osman would have eventually become the sultan, but for the establishment of the Turkish Republic, proclaimed in 1923.
For the past 64 years, Osman - formally His Imperial Highness Prince Ertugrul Osman - and his wife, Zeynep, a niece of a former Afghan king, lived in an apartment on Lexington Avenue in Manhattan. At one time they kept 12 dogs in their home, a two-bedroom unit up a narrow, dim stairway, and enlisted neighbourhood children to walk them.
Osman was often asked if he dreamed that the empire would be restored but always answered, flatly, no. ''I'm a very practical person,'' he said in 2006. ''Democracy works well in Turkey.''
In an interview for al-Jazeera television last year, he refused to say an unkind word about Mustafa Kemal Ataturk, who led the revolution that deposed his family.
Osman, who was born in Istanbul, 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,'' Osman said. ''The women were given a week.''
Osman attended school in Vienna and moved to New York in 1939. He returned to Turkey for the first time 53 years later, in August 1992, at the invitation of the prime minister. On that trip, he went to see the 285-room Dolmabahce Palace, which had been his grandfather's home - and where he had played as a child. He insisted on joining a tour group, despite the summer heat. ''I didn't want a fuss,'' he said.
As a young man, Osman ran a mining company, Wells Overseas, which required him to travel frequently to South America. Because he considered himself a citizen of the Ottoman Empire, he refused to carry the passport of any country. Instead, he travelled with a certificate devised by his lawyer. That might have continued to work had security measures not been tightened after the attacks of September 11, 2001. In 2004, he received a Turkish passport for the first time.
Osman often impressed interviewers with his dry wit and knowledge of trends in politics, architecture and pop culture.
When Didem Yilmaz, a filmmaker, interviewed him for Seeking the Sultan, a short documentary film about him, she expected to find him bitter about his life's trajectory. Instead, she said, he was ''kind, understanding and contemplative''. At one point, she added, Osman said to her knowingly: ''If I had a bad life, it would be better for your film.''
Osman married Gulda Twerskoy in 1947. She died in 1985. At a party in 1987, he met Zeynep Tarzi Hanim, an Afghan princess. Nearly 30 years his junior, she had been raised in Istanbul and was living in New York. They married in 1991. He has no other survivors.
NEW YORK TIMES