The ''Libri Feudorum'' is a twelfth-century collection, originating in

Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...

, of feudal customs. The work gained wide acceptance as a statement of the various rules governing the relation of lord and vassal. Later in the century it was integrated into civil law. It is an example of the increased rationalization of the law in the high Middle Ages. Its integration by civilians into the larger corpus of civil law demonstrates the interaction of

Roman law Roman law is the law, legal system of ancient Rome, including the legal developments spanning over a thousand years of jurisprudence, from the Twelve Tables (), to the (AD 529) ordered by Eastern Roman emperor Justinian I. Roman law also den ...

concepts with local law. J. G. A. Pocock noted that "Lombard feudalism possessed, in the ''Libri Feodorum'', the only written systematization of feudal law that had become part of the general legal heritage of Europe."Pocock, "The Ancient Constitution and the Feudal Law",70

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