Presents the heresiographical "Chapter on Satan"(Bāb al-shayṭān) from a long unrecognized Islmaili work called the Kitāb al-shajara by the 4th/10th century Khurāsānī dā‘ī, Abū Tammām.
Wilferd Madelung is Laudian Professor of Arabic at the University of Oxford. Paul E. Walker, Ph.D. (1974), University of Chicago, is the author of several books and a number of smaller studies on various aspects of Ismaili history and doctrine.