The Church XI century change (Gregorio VII and the ecclesiastical university) and the new Imperial "civilitas" were the bases for the development of the iuris system of Ius Commune. This way we can understand that the legal species that were born during the XIII century and developed until the XVI century, the Summae Confesorum (real iure civile and iure canonico treaties) were the origins and causes of development for the criminalJigurae, elaborated by jurists from the ratio vitanda peccati; jurists that never forgot that serving as guides for the confessors was their main business.