I am a medieval monster hunter. I have been for many years now. It is a weird job that consists in hunting down monsters in medieval art, and more particularly manuscripts. The great majority of these books, written on parchment, were of religious nature — Bibles, books of prayers, theological treatises. But the devil is never far; he often lurks in the corner of the image, ready to tempt or assault the good Christian. The devil is the prototype of monsters — but there are plenty of others. Damien Kempf is a Senior Lecturer in Medieval History at the University of Liverpool.