1911 Encyclopædia Britannica/Mokanna

MOKANNA (al-Moqanna’, the Veiled), the name given to Ḥakim, or ʽAṭā, a man of unknown parentage, originally a fuller in Merv, who posed as an incarnation of Deity, and headed a revolt in Khorāsān against the caliph Mahdī. For about three years he sustained himself in the field against the troops of the caliph and for two years longer in his fortress of Sanam; then, reduced to straits in 779, he and his followers took poison and set fire to the fortress. Much is related to his magical arts, especially of a moonlike light visible for an enormous distance which he made to rise from a pit near Nakhshab. He is the hero of the first part of Moore’s Lalla Rookh.