Enluminures is a website by Direction du livre et de la lecture and l'Institut de recherche et d'histoire des textes (CNRS) that makes images of a whole bunch of illuminated manuscripts available to the web based public.

To us, this is particularly nice as the Fleur de Lys is a french symbol, and appears once in a while in their manuscripts:

There's plenty of stuff there that should be of some use to the patrons of the Witch Hunters.

People with no grounding in French can try this Google translated version, although the images themselves are served with javascript generated pages and so are not translated by google.