Definition
Latin: "the old law." A term from Roman and civil law with two related but distinct uses:
1. In its specific sense, vetus jus refers to the Law of the Twelve Tables — the foundational Roman legal code dating to approximately 450 BCE, regarded as the root source of Roman law and a touchstone of ancient legal authority.
2. In its general sense, vetus jus refers to any law, principle, or doctrine that was in force prior to the enactment of a subsequent law — old law contrasted with new law, not necessarily ancient in origin.
Burrill adds a third shade of meaning: a law, principle, or doctrine of long standing, emphasizing duration and established authority rather than mere temporal priority.
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Common Confusion
Researchers should not conflate vetus jus with jus antiquum, which similarly invokes antiquity but carries somewhat different connotations in different civilian contexts, nor with lex antiqua, which more specifically denotes an old statute. The terms overlap in general usage but may be distinguished by their precise reference points in a given text. Additionally, vetus jus should not be read as synonymous with jus commune, which refers to the common legal heritage of the civilian tradition broadly — vetus jus points backward to a prior state of law, while jus commune describes a shared legal framework.
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Why It Matters in Research
This term appears almost exclusively in civil law and Roman law scholarship, and in treatises that engage the civilian tradition — canon law commentaries, early common law texts drawing on Roman sources, and comparative legal writing. Researchers will encounter it most often in footnotes and marginalia rather than as a substantive doctrinal term.
The dual usage creates a navigational trap: when a historical source invokes vetus jus, the researcher must determine whether the writer means the Twelve Tables specifically or simply the pre-existing law relative to some later enactment. Context usually resolves the question, but a misreading can distort interpretation of the source's argument about legal continuity or supersession.
In common law sources, vetus jus occasionally surfaces in discussions of statutory construction and implied repeal — the principle that a later statute supersedes conflicting prior law. The term is not itself a common law term of art, but civilian-trained writers and early equity jurists sometimes used it to frame the relationship between old and new rules. When researching the history of statutory interpretation or the reception of Roman law in English courts, encountering vetus jus signals that the author is drawing on civilian methodology.
The Codex citation given by Burrill (Cod. 9.2.6) anchors the third meaning in Justinian's Codex and provides a traceable primary source for researchers working in Roman law directly.
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Historical Dictionary Support
All three dictionary sources agree on the substance and present nearly identical text, suggesting a common derivation — Black's both editions and Burrill all cite Calvin (Calvinus, Magnum Lexicon Juridicum) as authority, with Burrill additionally citing the Codex. The entry is essentially stable across sources, indicating no contested evolution in how legal lexicographers understood the term.
What the historical dictionaries do not address is the rhetorical weight the term carried in Roman legal culture. Vetus jus was not merely a neutral descriptor; invoking the Law of the Twelve Tables in particular carried connotations of foundational legitimacy. Writers who cited vetus jus in that specific sense were often making an argument about the antiquity and therefore the authority of a rule, not merely identifying when it was enacted. The dictionaries record the definition without capturing this argumentative function.
Burrill's addition of "a law, principle or doctrine of long standing" extends the meaning usefully beyond the temporal framing of Black's, suggesting that vetus jus could serve as an appeal to customary authority — a doctrinal pedigree argument — as much as a chronological marker.
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