Explaining the origins of the law that one can see in the Cities of Refuge and and , Justice Oliver Wendell Holmes Jr. wrote that early forms of legal procedure were grounded in vengeance. Roman law and German law started from the blood feud, which led to the composition, at first optional, then compulsory, by which the feud was bought off. Holmes reported that in Anglo-Saxon practice, the feud was pretty well broken up by the time of William the Conqueror. The killings and house-burnings of an earlier day became the appeals of mayhem and arson, and then the legal actions now familiar to lawyers.