Le Moyen Age, everywhere would dominate violence, which is exacerbated by the brutality of morals. A quantitative study carried out strictly on the basis of the letters of reassignment issued by the Royal Chancellery, the archives of the Parliament and the Châtelet gives another image of crime in the Kingdom of France in the 14th and 15th centuries. It is true that violence exists, and homicide is, in many cases, the first of the capital crimes. But it is far from being the most serious. Not that a man’s life is of no value, but does it do if the reputation is breached? The company is in every place governed by a code of honour shared by all social strata. To grasp the scope of these common values, we needed to use the humanities that can be used by historian, all of which is served by the IT tool. The population of offenders and victims and the solidarity built around the criminal are analysed in as exhaustive a way as possible. As for the study of gestures and words used to tell the crime, it opens on another register: that of politics. However, despite the reformers and practitioners of a procedure which has become increasingly complex, the King of the Middle Age in France continues to resolve capital crimes through the right of grace conferred on him by his sacred power rather than by the rigour of his justice. Crime and violence have helped to build society and the state at the same time as threatening their existence. How have all of them, power, king and judges, as well as the public opinion that ultimately remains at the heart of the game, manipulated crime?