Legends and myths abound… A monk sold his soul to complete a biblical work. Reminds me of the old TV show Twillight Zone. The Codex Gigas (Giant Book) is the largest medieval illustrsted manuscript and bible in the world, also known as the Devil’s Bible because of a one full-page color illustration of the devil. This has nothing to do with a monk selling his soul to Satan.
The Codex was hand written and illustrated in the early 13th century in a Benedictine monastery in Czechoslovakia. The monks that created this large bible worked a decade to write and illustrate the Codex with hand calligraphy and hard work and by a TEAM of monks not s single author.
Some confusion arises because of a single illustration of the devil Satan himself on the opposite page is a story of heaven, the monk trying to show the difference between good and evil not glotifying Satan or as a symbol of the occult or as a sign that the monk who created the illustration was in league with the devil and sold his soul to complete this biblical work.
He must have sold his soul to the devil might be a nice metaphor for unequaled success but it has nothing to do with the Codex Gigas.