Hussaini, also known as the Aga Khan, died on Tuesday, February 4, aged 88. A colossally wealthy philanthropist, he was also the imam of the Nizari Ismaili faith, an esoteric branch of Shia Islam that changed the history of the Middle East.

Ismaili Muslims in B.C. were in mourning on Tuesday after the announcement of the death of their faith's spiritual leader, the Aga Khan.

Aga Khan IV, the 49th hereditary imam of the Nizari Isma’ilism sect of Shia Islam, has died in Lisbon, Portugal. The billionaire religious leader, whose birth name was Mawlana Shah Karim al Hussaini,