"The weaknesses of medieval chronicles are well-known. Their style is by and large turgid and ornamental; their narrative is often exaggerated. And this applies as much (if not more) to figures as to facts. A few no doubt are trustworthy but many of them are extremely faulty with regard to figures and statistics ; and almost all of them let their imagination and their pen run riot. Consequently, even when they are not quite reticent on demograghic matters, they are neither very informative nor always reliable."