The Codex Gigas is one of the largest surviving medieval manuscripts in the world. Believed to have been created by Herman the Recluse in the Benedictine monastery of Podlazice in Bohemia, the collection contains the Vulgate Bible as well as additional historical documents written in Latin. The monastery was destroyed during the Hussite Revolution. For more on the Hussite Revolution, I would recommend Victor Verney’s book Warrior of God.
The Codex Gigas is also commonly known as the Devil’s Bible due to the large illustration of the devil found inside. The manuscript now resides in the National Library of Sweden in Stockholm.
Stuff You Missed in History Class has a good podcast covering this topic as well as links to additional reading about the codex.