The paper deals with the relationships between judicial practices and the feud, which acquires interesting relevance both in customary systems and in systems governed by the legal process. First is described the crucial transition from customary practices mainly handled by the community (prevailing in the early medieval age) to practices managed by professionals (lawyers) and the procedures successively worked out by them. Feuding is examined along with the researches conducted on single European areas and for different historical periods, especially for the early Middle Ages, the Middle Ages, the Modern Age, considering the various disciplines used. In reality, while focusing on the relationship between the spread of violence and the need ...