Hashim (Arabic/Persian: هاشم), better known as al-Muqanna‘ (Arabic: المقنع "The Veiled", died ca. 783.) was a Persian who claimed to be a prophet, and founded a religion which was a mix of Zoroastrianism and Islam. He was a chemist, and one of his experiments caused an explosion in which a part of his face was burnt. For the rest of his life he used a veil and thus was known as "Almughanna" ("the veiled one"). Nafisi and Aryanpoor have elaborated on Khorram dinan. He is viewed as a heretic by mainstream Muslims.
Name and early life
Before he came to be known by the nickname of "al-Muqanna", he was called by his birth name, Hashim. Early scholars believed that he was born in Sogdia. However, it is now agreed that his birthplace was in Balkh, a city close to Sogdia.
Al-Muqanna‘ was an ethnic Persian from Merv named Hashim ibn Hakim, originally a clothes pleater. He became a commander for Abu Muslim of Khurasan. After Abu Muslim's murder in 755 AD, al-Muqanna‘ claimed to be an incarnation of God, a role, he insisted, passed to him from Abū Muslim, who received it via ‘Alī from the Islamic prophet Muhammad. Al-Muqanna‘ was reputed to wear a veil in order to cover up his beauty; however, the Abbasid Caliphate claimed that he wore it to hide his ugliness, being one-eyed and bald. His followers wore white clothes in opposition to Abbasid black. He is reputed to have engaged in magic to impress his followers as a maker of miracles.
Al-Muqanna‘ was instrumental in the formation of the Khurramiyya, a sect that claimed Abū Muslim to be the Mahdi and denied his death. When al-Muqanna‘'s followers started raiding towns and mosques of other Muslims and looting their possessions, the Abbasids sent several commanders to crush the rebellion. Al-Muqanna‘ poisoned himself rather than surrender to the Abbasids, who had set fire to his house. Al-Muqanna‘ died in a fort near Kesh. After his death, the sect continued to exist until the 12th century, waiting for al-Muqanna‘ to return again.
In 1787 Napoleon Bonaparte wrote a two-page short story about Al-Muqanna called "Le masque prophete". 
St. Louis businessmen referenced Moore's poem in 1878 when they created the Veiled Prophet Organization and concocted a legend of Mokanna as its founder. For many years the organization put on an annual fair and parade called the "Veiled Prophet Fair," which was renamed Fair Saint Louis in 1992. The organization also gives a debutante ball each December called the Veiled Prophet Ball.
The Mystic Order of Veiled Prophets of the Enchanted Realm (founded 1889), often known as "the Grotto", a social group with membership restricted to Master Masons, and its female auxiliary, the Daughters of Mokanna (founded 1919), also take their names from Thomas Moore's poem. 
Argentine writer Jorge Luis Borges used a fictionalized al-Muqanna‘ as the central character of The Masked Dyer, Hakim of Merv, a 1934 short story, and in another story fifteen years later, The Zahir, as a past avatar of the titular object.
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