Historia Dracorum is a book that Kazul keeps in her library in Dealing with Dragons . It is described as a "fat volume bound in worn leather, with the words Historia Dracorum in cracked and flaking gold leaf on the cover." It's contents also included "descriptions of dragons ravaging villages, carrying off princesses, defeating knights and princes (and occasionally being defeated by them), and fighting with with wizards, giants and each other." Besides describing battles, it also told of "famous dragons' hoards and peculiar draconian customs."
When Zemenar visits the library he looks at the book, specifcally a section about the Caves of Fire and Night.