The Doom Book, Dōmbōc, Code of Alfred or Legal Code of Ælfred the Great was the code of laws compiled by Alfred the Great. Alfred codified three prior Saxon codes – those of Æthelberht of Kent, Ine of Wessex and Offa of Mercia – to which he prefixed a modified version of the Ten Commandments of Moses and incorporated rules of life from the Mosaic Code and the Christian code of ethics.