The early modern legal history, and especially the history of the law sources, has a necessary focus on the jurisprudential experience and on the legal (and political) culture of the 16th Century. The Parliament of Paris, and his practices and proceedings, is a fundamental institution of this framing. The clashes between monarch and court were frequent, and often terminated by imposing the ‘lit de justice’, that is the fullfilment of the king’s will and of a particular vision of the royal authority. In this experience we can discover some traces of the ‘legality’ in his becoming in continental Europe.