Definition
The Book of Fiefs (Latin: Liber Feudorum, also rendered Libri Feudorum or Feudorum Libri) is a medieval compilation of feudal law originating in northern Italy, principally Lombardy, that gathered and systematized the customs and rules governing the holding of fiefs — that is, lands granted by a lord to a vassal in exchange for homage, loyalty, and service. The work developed over time through multiple redactions, drawing on judicial decisions, scholarly commentary, and local feudal custom, and eventually circulated widely in continental Europe as an authoritative text on the law of feudal tenure. It was frequently appended to editions of the Corpus Juris Civilis, giving it quasi-official standing among civilian jurists.
Note on Burrill's usage: Burrill's entry conflates two distinct referents under this heading — the Liber Feudorum (the Italian compilation) and the "bordarii," a class of agricultural land-occupiers recorded in the Domesday Survey of England. These are separate matters. The Domesday reference describes a tenure classification in English medieval administration, not the continental text. Researchers should treat these as distinct topics that happen to share an entry in Burrill.
Common Confusion
The Book of Fiefs is sometimes loosely equated with any medieval feudal register or land record (such as English feudal surveys or inquisitions post mortem). These are categorically different documents. The Libri Feudorum is a juristic compilation — a legal text designed to state and systematize feudal law — not an administrative survey or inventory of landholdings. Domesday Book, by contrast, is a royal administrative survey. The two serve different functions and should not be treated as equivalent.
Recognized Forms
/SUBTYPES
The Libri Feudorum went through several recognized textual stages:
Early redaction (Obertine): An initial compilation attributed to Oberto dell'Orto, a Milanese judge, drawing on Lombard feudal custom, circa the early twelfth century.
Expanded redaction (Arduinine): A subsequent version attributed to Gerardo Arduino, incorporating additional material and judicial glosses.
Accursian recension: The version edited and glossed by Accursius in the thirteenth century, which became the standard text circulated with the Corpus Juris Civilis and used in university legal instruction throughout the ius commune tradition.
Why It Matters in Research
Researchers encounter the Book of Fiefs most often in two distinct research contexts that require care to keep separate.
First, in continental legal history and ius commune research, the Libri Feudorum is a primary source for understanding how feudal tenure was theorized, taught, and administered across medieval and early modern Europe. Because it traveled with the Corpus Juris Civilis, civilian jurists treated it as part of the learned law tradition, and commentaries on it form a significant body of scholarship. Researchers working in canon law, civil law, or comparative medieval legal history need to situate the text within this tradition.
Second, in English legal history research, the term "Book of Fiefs" may surface in sources discussing Domesday classifications or feudal tenure in the common law tradition, where the conceptual vocabulary overlaps with but diverges from the continental framework. English feudal tenure developed along its own doctrinal path, and importing continental Lombard feudal concepts directly into English medieval legal analysis is a persistent trap in older scholarship.
Burrill's entry is an example of the confusion: it introduces the Latin Liber Feudorum correctly but then slides into a discussion of Domesday bordarii — a class of agricultural tenants — without clearly signaling the shift. Researchers relying on Burrill's entry alone will encounter a misleading blend of two unrelated topics.
For Law Mind corpus research, this term will appear primarily in historical materials dealing with feudal tenure, land law, and the medieval inheritance of Roman and Lombard legal concepts. It has little operational presence in modern Anglo-American case law or statute.
Historical Dictionary Support
Burrill's Law Dictionary is the primary shelf source with an entry for this term, and it presents the problems described above. Burrill correctly identifies the Latin equivalent (Liber Feudorum) and directs the reader to Kent's Commentaries (3 Kent's Com. 496, note) for further treatment, which is a useful pointer. Kent's Commentaries provides a more disciplined discussion of feudal tenure in the common law tradition and is a better starting point for understanding the English reception of feudal land concepts.
What Burrill's entry misses: it does not explain the textual history of the Libri Feudorum, its role in civilian university education, or why the work was appended to the Corpus Juris Civilis. It also does not distinguish between the Lombard feudal law tradition and English feudal tenure in any useful way. For a fuller historical treatment, researchers should consult sources in the ius commune and medieval legal history tradition directly rather than relying on Burrill's compressed and conflated entry.