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.

The Aga Khan IV was often referred to as a philanthropist, but the description ignores the spiritual impetus for his work.

Prince Karim later became widely recognised as Aga Khan IV, serving as the 49th Imam of the Shia Ismaili Muslims. Tanzanian President Samia Suluhu Hassan and Zanzibar President Dr Hussein Mwinyi joined world leaders in mourning his passing.