“Like Tyson’s Necronomicon and related works, Alhazred draws heavily from the work of early 20th-century American fiction writer H. P. Lovecraft.”
NO MAJOR SPOILERS
Abdul al Hazred, better known as the Mad Arab, was the author of the Necronomicon (“Book of the Law of the Dead”); a notorious tome that recounted his learnings and explorations of the occult mysteries of the vast and trackless wastes of the deserts of Sana’a.
Best known as a hagiography of the Old Gods; Yog Sothoth, Cthulhu, Baal, Yig, Nyarlathotep, etc the Necronomicon is, in fact, a completely fictional work that exists only within the Cthulhu Mythos started by HP Lovecraft and perpetuated by a raft of like-minded authors ever since Howard Phillips (that incorrigible old racist) first put pen to paper.