Early Sufi master Abū Bakr al-Shiblī (d. 946) is both famous and unknown. One of the pioneers of Islamic mysticism, he left no writings, but his legacy was passed down orally, and he has been acclaimed from his own time to the present. Accounts of Shiblī present a fascinating figure: an eccentric with a showy red beard, a lover of poetry and wit, an ascetic who embraced altered states of consciousness, and, for a time, a disturbed man...