I remember reading a page elsewhere that in the winter of 1450, a pack of wolves entered Paris through a breach in the walls of the city, and killed around 40 Parisians before being driven back to Notre Dame Cathedral and slaughtered. However, I have yet to find a verified source on this particular event - has there ever been a book or article written about this? The wikipedia page has since been deleted, I can't seem to find that vital, first verified source for it, unless it's an urban legend after all.