Aga Khan - Forbes Magazine June 2009

In Pictures: World's Richest Royals

© Press Association via AP Images Prince Karim Al Husseini, Aga Khan Fortune: $800 million (down $200 million) Age: 72 Spiritual leader of the world's Ismaili Muslims chairs the Aga Khan Development Network that promotes investments in Asia and Africa. Horse racing enthusiast owns 900 thoroughbreds at stud farms in Ireland and France; holds stake in Goffs, one of Britain's largest horse auction houses, as well as French horse auction house Arqana. Values down in belt-tightening markets. Awarded titles of Grand Patron and Grand Donor by the French Minister for Culture for his contributions to cultural development in France; also made an honorary citizen of Canada in the past year.