This book presents a full and updated portrait of al-Junayd al-Baghdādī, a towering figure in the history of Islamic piety and thought. Examining the character of Junayd as both an architect of the Sufi mainstream as well as a charismatic and pragmatic personality, the book explores Junayd’s sophisticated relationships within Sufi circles as well as the broader circle of Islamic piety. Besides constructing a balanced portrait of Junayd, this monograph also examines Junayd’s legacy in order to flesh out some of the socio-religious and historical settings of that period. This book is an important read for scholars of religion, Islamic studies, mediaeval Muslim culture, as well as historians and researchers in the field of Islamic studies.