The Grand Grimoire, The Red Dragon, Gospel of Satan. Was found in Jerusalem in 1750 Written around 1200 CE this book is said to contain writings on how to summon Satan, and other demons such as Pazuzu -Vatican Archives.
The Codex Gigas. The largest medieval manuscript in existence. Written by a single scribe in the century. Sometimes called The Devil's Bible because of the large, unexplained picture of Satan in the middle of the book.