I have read the necronimicon and its interesting but i didnt have any demons come visit me.
The Necronomicon was written in Damascus in 730 A.D. by Abdul Alhazred. I dunno if he is a historical figure or what. Little is known about him. Popular legend holds he died in borad daylight by being ripped to shred by invisible claws.
What is probably more true is that he was a scholar, well versed in many languages. The original Arabic document has never been found (as far as we know) The last known time an ancient arabic version of the Necronimicon was found was when a Latin translation was made in 1487 by a Dominican priest Olaus Wormius. He was later burned at the stake for trying to translate it :)
Alhazred appears to have had access to many sources now lost, and events which are only hinted at in Genesis or the apocryphal Book of Enoch, or disguised as mythology in other sources, are explored in great detail.
He believed that many species besides the human race had inhabited the Earth, and that much knowledge was passed to mankind in encounters with beings from "beyond the spheres" or from "other spheres".
He shared with some Neoplatonists the belief that the stars are similar to our sun, and have their own unseen planets with their own lifeforms.
He was also convinced that he had contacted beings he called the "Old Ones" using magical invocations, and warned of terrible powers waiting to return to re-claim the Earth. He interpreted this belief (most surprisingly!) in the light of the Apocalypse of St. John, but reversed the ending so that the Beast triumphs after a great war in which the earth is laid waste.
These 'old ones' are what many erefer to as demons. He beleived the 'old ones' could help us using their dark powers.
According to Alhazred, the Old Ones were beings from "beyond the spheres", presumably the spheres of the planets, and in the cosmography of that period this would imply the region of the fixed stars or beyond. They were superhuman and extrahuman. They mated with humans and begat monstrous offspring. They passed forbidden knowledge to humankind. They were forever seeking a channel into our plane of existence.
As for the original copy, most current versions are considered to be incomplete or completley inaccurate.
the years from 1933-38 the few known copies of the Necronomicon simply disappeared; someone in the German government of Adolf Hitler took an interest in obscure occult literature and began to obtain copies by fair means or foul. Dee's translation disappeared from the Bodleian following a break-in in the spring of 1934. The British Museum suffered several abortive burglaries, and the Wormius edition was deleted from the catalogue and removed to an underground repository in a converted slate mine in Wales (where the Crown Jewels were stored during the 1939-45 war). Other libraries lost their copies, and today there is no library with a genuine catalogue entry for the Necronomicon. The current whereabouts of copies of the Necronomicon is unknown, but there is a story of a large wartime cache of occult and magical documents in the mountainous Osterhorn area near Salzburg - this may be connected with the recurring story of a copy bound in the skin of concentration camp victims.