The Necronomicon was the invention of H.P. Lovecraft, a very prolific horror and weird fiction writer in the early decades of the last century. His influence on genre fiction literally cannot be overstated. If you aren't familiar with his work, I highly recommend reading up on him
, and maybe diving into a short story or two
--most of it is public domain, and if audio is more your style, there are some podcasts
out there that produce
of his work from time to time
He often encouraged his friends, be they aspiring writers or big names themselves, to borrow freely from the collection of ideas he referred to as Yogsosothery (named after one of his ancient godlike aliens), which is now known as the Cthulhu Mythos (named after one of his other ancient alien deities). It was through this channel and that of his own stories that concepts such as Cthulhu, the Necronomicon, and the Great Old Ones, overwhelming cosmic horror, that which man was Not Meant to Know, and so much more seeped into popular culture in general and all things horror in particular.
This Necronomicon isn't strictly the one from Lovecraft's stories, but rather my interpretation of the one from Evil Dead 2. I wanted the exterior to have that ridged, bound in human flesh look. The inside was more difficult . . . but we'll come to that in the next step. Here's the intro from the movie: