Prince Karim, 88, was given the title of “His Highness” by Queen Elizabeth in July 1957, two weeks after his grandfather, the Aga Khan III, unexpectedly made him heir to the family’s 1,300-year dynasty as leader of the Ismaili Muslim sect.

A burial service for Aga Khan IV, the 49th hereditary imam of the Shiite Ismaili Muslims, was held in the southern Egyptian province of Aswan on Sunday. After a procession through the streets, his body was carried down the Nile in a white boat.

Prince Karim, Aga Khan IV, was laid to rest in a private ceremony in Aswan, Egypt. His son, Rahim Al-Hussaini, has been named Aga Khan V, continuing the Ismaili Muslim spiritual leadership. World leaders attended a service in Lisbon.