The ruins of the Nizari fortress of Masayf in Syria. The Nizari Ismailis, often referred by the pejorative term Assassins, operated out of fortified castles during the medieval period.

The Order of Assassins is loosely based on the Nizari Ismailis, ... leaving two claimants to the imamate: his eldest son and designated successor, Nizar, and a younger son, Ahmad.

Aga Khan IV, Prince Shah Karim Al Hussaini, the spiritual leader of Nizari Ismaili Muslims worldwide, is dead. He passed away in Lisbon at the age of 88, his development network said on Tuesday.

Aga Khan, 49th Imam of Nizari Ismailis gives an interview as he arrives in London for an official visit in 1957. Daily Mail. 1957: Aga Khan talks about muslim education after arriving in London.

The Nizari Ismaili sect of Shia Islam is little known in Australia but, in other parts of the globe as well as in East Africa, it is known for its top-quality schools and hospitals and clean water ...

Prince Shah Karim Al Hussaini, the 49th hereditary leader of Nizari Ismailism, a branch of Shia Islam, is in Canada to celebrate 60 years — his diamond jubilee — as Imam.