More on Mokanna from Infoplease:

• Mokanna - Mokanna [See Khorassan.] Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894 Related ...
• Khorassan - Khorassan [Region of the Sun ]. A province of Persia, anciently called Ariana. The Veiled Prophet ...
• Veiled Prophet of Khorassan - Veiled Prophet of Khorassan The first poetical tale in Thomas Moore's Lalla Rookh. The Veiled ...
• Dictionary of Phrase and Fable: M - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "M"