15th century, illuminated by Flemish masters

Bibliothèque de l’Arsenal

Ms-5070 réserve: Decameron by Giovanni Boccaccio (French translation by Laurent de Premierfait)

fol. 23r

A young monk lapses into seducing a young woman and is secretly observed by an elder abbot. However, he knows that he has been seen and so leaves, on pretense of finishing a task, and gives the key to his room to the abbot, who then goes to see the girl for himself. On seeing the girl, the abbot then is seduced. The monk, who hid watching all of this, uses it to balk prosecution. The monk and the abbot quickly rush the woman out of the monastery and often bring her back in.

- from wikipedia