The Aga Khan addresses an audience about the challenges to a pluralistic society on Nov. 12, 2015, at the Memorial Church on the campus of Harvard University, in Cambridge, Mass.

Prince Rahim al-Hussaini, a son of the Aga Khan IV, was named as his successor on Wednesday, inheriting the role of spiritual leader of millions of Ismaili Muslims around the world. Rahim, 53 ...