Definition
*Tiqui* is an abbreviated reference to the Latin phrase *de diversis regulis iuris antiqui* — "of divers rules of the ancient law" — which is the title of the final and celebrated section of the Digest (also called the Pandects) of Justinian's *Corpus Juris Civilis*. This section, found at Digest 50.17, comprises 211 maxims and general principles of Roman law extracted from the writings of the classical jurists. The abbreviation *tiqui* (sometimes rendered *tiq.*, from the initial letters of the Latin title) served as a shorthand citation reference in medieval and early modern legal scholarship and commentary.
The 211 rules gathered in Digest 50.17 represent the Roman jurists' effort to distill recurring legal principles into concise, general statements — a kind of foundational grammar of Roman private law. These maxims were not merely academic exercises; they were treated as authoritative legal propositions that could be invoked in pleading, argumentation, and judicial reasoning throughout the civilian tradition.
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Why It Matters in Research
Researchers encountering *tiqui* or its abbreviation in historical legal texts — particularly in civilian treatises, canon law commentaries, and early common law scholarship — should understand it as a citation locator pointing to Digest 50.17, not a substantive legal doctrine in its own right. The abbreviation appears most frequently in glossed manuscripts and printed editions of the *Corpus Juris Civilis* where margin notes and cross-references employed compressed Latin shorthand.
The practical research trap here is terminological: a researcher unfamiliar with the abbreviation convention may fail to recognize *tiqui* as a pointer to the Digest's final title and instead treat it as an obscure procedural term or even a proper name. Legal maxims cited without context in common law sources — particularly in the Year Books, Bracton, or later treatise writers such as Coke — frequently trace back to Digest 50.17 without explicit attribution, meaning the *tiqui* tradition operates as a silent structural underpinning of doctrines that appear, on the surface, to be native common law principles.
For corpus researchers working with Law Mind materials spanning civilian and common law traditions, Digest 50.17 is a critical connective tissue document. Many maxims that appear in English legal dictionaries and treatises — including Blackstone — without acknowledged Roman origin are drawn directly from this title. Recognizing the *tiqui* abbreviation is therefore an entry point into source tracing.
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Historical Dictionary Support
Black's Law Dictionary (2nd Ed.) identifies *tiqui* precisely and accurately: it is described as "[o]f 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." This is a reliable and complete entry for what the abbreviation signifies.
What the historical dictionary entry does not address is the interpretive weight carried by these rules in practice. The 211 maxims of Digest 50.17 were not uniform in authority. Civilians debated which maxims reflected universal principle and which were contextually limited, and early glossators such as Accursius devoted substantial effort to limiting or expanding particular rules. Black's treatment, characteristically, provides the bibliographic and definitional function without entering that jurisprudential terrain.
Earlier English legal dictionaries with strong civilian influence — such as Jacob's *Law Dictionary* — similarly treat the *de regulis iuris* title as a reference point rather than a subject of analysis. This reflects the position of Roman-law scholarship in the Anglo-American tradition: present as structural scaffolding, but rarely foregrounded.
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Jurisdictional Note
*Tiqui* and the underlying Digest 50.17 are primarily relevant to civilian and mixed-law jurisdictions (Scotland, Louisiana, Quebec, South Africa) where the *Corpus Juris Civilis* retains direct doctrinal authority. In common law jurisdictions, the maxims of Digest 50.17 entered practice indirectly through treatise literature and are encountered in research rather than in modern pleading or judicial citation.
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