Muqannaʿ, al-(Arabic: “The Arabic“The Veiled One”), byname of Hāshim Ibn ibn Ḥākim  (died 779 783 )  religious leader, originally a fuller (cloth processor) from Merv, in Khorāsān, who led a revolt in that province against the ʿAbbāsid caliph al-Mahdī. Preaching a doctrine combining elements of Islām Islam and Zoroastrianism, al-Muquannaʿ Muqannaʿ carried on warfare for about three years in the field and for two years longer in his fortress of Sanam Sanām before he was eventually defeated and committed suicide. He was the hero of the narrative poem Lalla Rookh (1817) by Thomas Moore.