Codex Gigas, known as ‘the Devil’s Bible,’ is the largest and most probably the strangest medieval manuscripts in the world.
There is a portrait drawing of devilin full page, fuels the rumors of it's being the Devil's Bible
It is one of the best preserved manuscripts in the world.
It's made with more than 160 animal skins. (whether 160 differnt animals or made with the skin of the same animal that's I am not sure about )
Some sources say he used 160 donkey skin