Benedictine monk living in the monastery of Podlažice was sentenced to be walled up alive after breaking his vows, the legend goes. In a desperate attempt to avoid his punishment, he promised he would create, in a single night, a book that would include all human knowledge.
The abbot, out of mercy, couldn’t but accept the man’s proposal. But near midnight, the monk realized he could not complete the task alone, so asked the devil to him to help him finish the book, in exchange for his soul. The devil completed the manuscript and the monk added an image of the fallen angel in the book, allegedly out of gratitude for his aid. (Read the full article here)
Here you’ll find some interesting photos on the subject.