Ismaili Shi’ah refers to the group of Shi’i Muslims who, upon the death of the sixth Imam Ja’far al-Sadiq in 765, affirmed his son Isma’il to be the next Imam. The Ismailis further split in 1094 into Mustali and Nizari branches. Emphasizing the necessity of continual interpretation of Islam to meet contemporary challenges, the current Imam of the Nizari Ismaili branch is the Aga Khan. Nizari Ismailis live throughout the Middle East, South and Central Asia, East Africa and increasingly in Western Europe and North America.