Canadian Prime Minister Justin Trudeau and Spain’s King Emeritus Juan Carlos were among the dignitaries who attended Saturday’s private ceremony for His Highness Prince Karim Al-Hussaini at the Ismaili community center. Portugal’s President Marcelo Rebelo de Sousa and the mayor of Lisbon were also among the mourners.

Hussaini, Aga Khan IV ends an illustrious and transformative 49th Imamat, the office of spiritual leadership of the Nizari Ismaili Muslims.

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.

Rahim Al-Hussaini was named Wednesday as the new Aga Khan, spiritual leader of the world’s millions of Ismaili Muslims, following the death of his father.

LISBON, Portugal — The Aga Khan, who became the spiritual leader of the world’s millions of Ismaili Muslims at age 20 as a Harvard undergraduate and poured a material empire built on billions of dollars in tithes into building homes, hospitals and schools in developing countries, has died. He was 88.

The funeral of Aga Khan IV, the 49th hereditary imam of the Shiite Ismaili Muslims, took place in Lisbon on Saturday. The Associated Press reported that Canadian Prime Minister Justin Trudeau and Spain's King Emeritus Juan Carlos were among the dignitaries who attended the private ceremony for His Highness Prince Karim Al-Hussaini at the Ismaili community centre.