Definition
De Diversis Regulis Juris Antiqui (Latin: "of the various rules of the ancient law") is the title of the final section of the Corpus Juris Civilis's Digest, appearing at Digest 50.17. It is a compiled collection of 211 legal maxims and general rules distilled from classical Roman jurisprudence, assembled under the authority of the Emperor Justinian in the sixth century. The title functions not as a body of substantive law in the ordinary sense but as a repository of foundational legal principles — generalized statements about how law operates, abstracted from the specific opinions of classical jurists. Its placement as the closing title of the entire Digest gave it a particular prestige in the Western legal tradition, lending these maxims an almost axiomatic quality in later civil law scholarship.
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Common Language
This section is omitted. De Diversis Regulis Juris Antiqui is pure legal and scholarly Latin terminology with no meaningful counterpart in ordinary English usage.
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Why It Matters in Research
Researchers encounter De Diversis Regulis Juris Antiqui in at least three distinct contexts, each carrying different interpretive demands.
First, in civil law and mixed-system jurisdictions, maxims drawn from Digest 50.17 appear with regularity in judicial opinions, treatises, and scholarly commentary as authoritative statements of general principle. A researcher tracing the origin of a Latin legal maxim — particularly one without an obvious common law pedigree — should check Digest 50.17 as a first stop. Many familiar maxims, including those appearing in English common law literature by way of civilian borrowing, trace back to this title.
Second, in historical common law research, the maxims of De Diversis Regulis Juris Antiqui were frequently cited by early common lawyers and equity judges who had received humanist legal educations. Selden, Coke, and later Blackstone-era commentators sometimes invoked Digest 50.17 maxims as persuasive authority or rhetorical support. A researcher working in equity, early chancery practice, or colonial American legal materials should be alert to the presence of these maxims as civil law influences even within nominally common law sources.
Third, for comparative law research, the corpus of 211 rules provides a baseline for analyzing how particular jurisdictions absorbed, modified, or rejected Roman law principles. Because the same Digest 50.17 maxim may be construed differently across French, Spanish, Scottish, and Louisiana legal traditions, identifying the original text is essential before pursuing comparative analysis.
One trap for researchers: Black's 2nd edition spells the term "An-Tiqui" with a hyphen, which appears to be a typographical artifact of the original printing. All substantive legal sources use the single word "Antiqui." Searches in digitized historical databases using the hyphenated form may miss relevant records.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed., Supplemental) provides a compact but accurate entry: "of divers rules of the ancient law. A celebrated title of the Digests, and the last in that collection. It consists of two hundred and eleven rules or maxims. Dig. 50. 17." The entry is correct on all material points — the translation, the placement as the final title, the rule count, and the Digest citation.
What Black's does not convey is the jurisprudential significance of the title's position. The Digest's compilers, working under Tribonian, did not place this collection last by accident. Its placement signals that the 211 maxims were understood as meta-legal principles — statements about law itself rather than about specific legal relationships — appropriate to close a monument of legal codification. Later civilian commentators treated De Diversis Regulis Juris Antiqui as a kind of distilled legal philosophy, and the maxims were extensively glossed by the medieval Glossators and Commentators.
Historical dictionaries across the civilian tradition are consistent in their description of this title. No meaningful divergence exists among the reference sources on basic facts. The gap in historical dictionary treatment generally lies not in error but in compression: the entries note what the title is without illuminating how its maxims functioned as living instruments across fifteen centuries of legal development.
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Jurisdictional Note
The authority of De Diversis Regulis Juris Antiqui varies sharply by legal system. In civil law jurisdictions with strong Roman law foundations — Louisiana, Quebec, Scotland, South Africa — these maxims carry genuine interpretive weight and appear in case law. In common law jurisdictions, they function at most as persuasive authority or historical context, and courts rarely cite Digest 50.17 directly.
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Digest of Justinian; Roman Law in Western Legal Tradition; Legal Maxims and Their Authority
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