More than 80 years after his family was ordered from the country, the grandson of one of the last Ottoman sultans was buried Saturday as hundreds of admirers looked on. Ertugrul Osman, grandson of Sultan Abdulhamid II and heir to the Ottoman throne, died this week in Istanbul of kidney failure at the age of 97, after having lived most of his life in exile in a humble third-floor walk-up apartment on Manhattan’s Upper East Side