The ''Libri Feudorum'' is a twelfth-century collection by Pillius Medicinensis, originating in Lombardy, 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 Civil law may refer to: * Civil law (common law), the part of law that concerns private citizens and legal persons * Civil law (legal system), or continental law, a legal system originating in continental Europe and based on Roman law ** Private la ...

. It is a significant example of an increasing need for the rationalization of law. Its integration by civilians into the larger corpus of civil law demonstrates the interaction of

Roman law Roman law is the legal system of ancient Rome, including the legal developments spanning over a thousand years of jurisprudence, from the Twelve Tables (c. 449 BC), to the '' Corpus Juris Civilis'' (AD 529) ordered by Eastern Roman emperor Jus ...

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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Medieval law Legal history of Italy {{Europe-law-stub