A comprehensive treatment of Ismaili medieval history in its entirety. It will have great appeal to all scholars of medieval Islam. Farhad Daftary is one of the world's leading authorities on Ismaili history and literature. This important book, by an internationally acknowledged expert in Ismaili studies, introduces Ismaili history and thought in medieval times. Discussing the different phases in Ismaili history, it describes both the early Ismailis as well as the contributions of the later Ismailis to Islamic culture. A number of chapters deal with key Ismaili individuals such as Hasan-i Sabbah. Other chapters contextualise the Ismailis within the early Muslim societies, in addition to investigating the Ismaili-Crusader relations and the resulting legends on the Ismaili secret practices. Over the course of the work, it becomes clear that Ismaili historiography, and the perception of the Ismailis by others (in both Muslim and Christian milieus), have had a fascinating evolution. During their long history the Ismailis have often been accused of various heretical teachings and practices and - at the same time - a multitude of myths and misconceptions have ciculated about them. Farhad Daftary here separates myth from fact, propaganda from actuality, in a work characterised by his customary mastery of the sources and literature.