Ismaili Muslims said a last goodbye on Saturday to their late spiritual leader, Aga Khan IV, at a private funeral ceremony in Lisbon attended by dignitaries and foreign leaders. Saturday's private ceremony at the Ismaili community centre in Lisbon was attended by more than 300 guests,

Hussaini, son of Prince Karim Al-Hussaini Aga Khan IV, has been named in his father’s will as his successor to lead the Nizari Ismailis, a Shia Muslim denomination. We take a look at this branch of Shia Islam that has 15 million members worldwide.

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,