This is a massive 13th-century medieval manuscript famous for its large full-page illustration of the devil.

: It is considered a masterpiece of medieval art and history. Scholars appreciate it for its scale and historical records, though it is often sensationalized in pop culture.

When searching for "Библия дьявола" (The Devil's Bible) in Russian, the results typically refer to one of two very different books: the historical or The Satanic Bible by Anton LaVey. 1. Codex Gigas (The Historical "Devil's Bible")