Definition
Latin: "black book." A term applied to several distinct ancient English records and registers, each bound in black or associated with that name. The most frequently cited in legal and historical sources is the Liber Niger Domus Regis (Black Book of the King's Household), a compilation associated with the reign of Edward IV that documented the organization of the royal household, its officers, domestic establishment, and retained musicians — both for private entertainment and chapel service. The name was applied to multiple medieval registers across different institutions, so the specific document intended must be determined by context.
Common Confusion
Because the name "black book" was applied to several distinct medieval records, references in historical sources to Liber Niger or "the Black Book" are ambiguous without additional context. Among the most significant bearers of this name: the Liber Niger Domus Regis (Edward IV's household book); the Liber Niger of Peterborough, a twelfth-century cartulary recording monastic lands and customs; and the Black Books of the Exchequer (Liber Niger Scaccarii), which preserved records of feudal tenures and knights' fees. A researcher encountering "Liber Niger" in a medieval or early modern source should not assume any single standard document — identification requires context, institution, and date.
Why It Matters in Research
This term is a navigational hazard rather than a stable legal concept. It functions less as a defined legal term and more as a descriptive label that attaches to multiple primary sources from different institutions and centuries. Researchers working in English constitutional history, feudal tenure, ecclesiastical records, or administrative history may encounter it in any of several distinct contexts.
The Liber Niger Scaccarii (Black Book of the Exchequer) is particularly significant for feudal and property research: it contains returns from the 1166 Cartae Baronum — sworn statements by tenants-in-chief recording the number of knights' fees they held — making it a primary source for the structure of Norman and Angevin feudal tenure. Researchers in that area should not rely on legal dictionary definitions, which address the household book, not the Exchequer record.
The Liber Niger of Peterborough is relevant to researchers working on monastic cartularies and early English land records. It is not a royal document and has no direct connection to the royal household book.
For Law Mind corpus researchers: when Liber Niger appears in older treatises on English land law, feudal tenures, or constitutional history, the Exchequer book or a monastic cartulary is more likely the intended reference than the royal household register. Black's Law Dictionary defines primarily the household book under this heading, but that reflects the dictionary's scope rather than the term's primary legal significance. Do not let the dictionary entry govern your identification of the source.
Historical Dictionary Support
Black's Law Dictionary treats Liber Niger as a sub-entry under "Black Book," identifying it primarily with the Liber Niger Domus Regis — the Edwardian household register — and noting its records of household staff and musicians. Burrill's Law Dictionary is more economical, simply translating the term as "black book" and cross-referencing the Black Book entry without independent elaboration. Neither dictionary addresses the Liber Niger Scaccarii or the monastic cartularies, which limits their utility for a researcher working on feudal tenure or ecclesiastical sources. Both sources agree on the literal translation and the royal household identification; neither pretends to catalogue all documents bearing the name. The absence of the Exchequer record from these entries is a significant gap that any researcher in medieval English legal history should note.
Jurisdictional Note
Exclusively relevant to English legal history. No equivalent in other common law jurisdictions or civil law systems. References in American legal sources are historical only.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Feudal Tenure; Medieval English Administration; Cartulary Records.