The Mad Arab Abdul Alhazred is the writer of the Necronomicon. It should be noted that the man, while writing the Necronomicon, he used a false name,as according to Arabic gramar, the proper name would be Abd-al Hazred, or Abdul Hazred. Thus, it is believe that, while under the Lovecraftian's influence, he changed his name to protect his identity.
It is unknown what became of the Mad Arab but according to H.P. Lovecraft, of his final death or disappearance (738 A.D.) many terrible and conflicting things are told. He is said by Ibn Khallikan, a 13th century biographer, to have been seized by an invisible monster in broad daylight and devoured horribly before a large number of fright-frozen witnesses.
Of his madness many things are told. He claimed to have seen fabulous Irem, or City of Pillars, and to have found beneath the ruins of a certain nameless desert town the shocking annals and secrets of a race older than mankind. He was only an indifferent Muslim, worshipping unknown entities whom he called Yog-Sothoth and Cthulhu.
Others believed that Alhazred was kidnapped in Damascus and brought to the Nameless City, where he had earlier studied and learned some of Necronomicon's secrets. As punishment for his betrayal of their secrets, Alhazred was tortured by the Great Old Ones. Then they blinded him and severed his tongue, and finally executed him. His burial site is rumored to be hidden within the Nameless City itself.