Definition
A Latin legal term meaning "the trial by twelve men," referring to jury trial. In historical usage, the phrase was applied specifically to juries *de medietate linguae* — mixed juries composed half of native subjects and half of foreign nationals of the same language or nationality as a party, used in cases where one party was an alien.
The term combines *duodecim* (twelve) with *virale* (of men) and *judicium* (judgment or trial), producing a phrase that describes the foundational numerical composition of the common law jury.
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Common Confusion
DUODECEMVIRALE JUDICIUM should not be read as a general synonym for any jury proceeding. Burrill applies it specifically to the *de medietate linguae* jury — a specialized institution for mixed alien-citizen panels — rather than to ordinary twelve-person juries at common law. A researcher encountering the phrase in historical sources should determine whether the context concerns an alien party and a mixed panel, not simply any trial by twelve.
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Why It Matters in Research
This term appears almost exclusively in early English and colonial-era common law sources dealing with merchant law and admiralty practice, where foreign traders frequently litigated in English courts. The *de medietate linguae* jury it describes was a recognized procedural device in those contexts, granting alien parties a tribunal of mixed composition.
Researchers working in Law Mind's historical maritime or merchant law materials should be alert to the term appearing in discussions of alien privileges and procedural accommodations. Burrill cites Molloy's *De Jure Maritimo et Navali* as the source of this application, which is a significant pointer: Charles Molloy's treatise (first published 1676) is a primary reference for seventeenth-century English maritime practice and will be the natural companion text when this phrase surfaces.
The term has no modern operational significance. The *de medietate linguae* jury was abolished in England by statute in the nineteenth century and was never a stable feature of American practice. Encountering this phrase in a modern document would be an affectation or a direct quotation from historical authority. In historical sources, however, it signals a specific procedural context — alien party, mixed panel, merchant or admiralty setting — that a researcher should flag before drawing broader conclusions about jury practice.
Because the phrase is purely Latin and technical, it may be indexed inconsistently in older digests. Searches in historical corpora should include variant Latin forms as well as the English equivalents "trial by twelve" and "jury de medietate linguae."
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Historical Dictionary Support
Burrill's entry is brief and functional: it supplies the translation, identifies the specific application to *de medietate linguae* juries, and cites Molloy. No other source dictionaries in the current corpus cover the term.
The single-source record is itself informative. The term is narrow enough that it does not appear to have generated substantial lexicographic treatment beyond specialist maritime and procedural works. Burrill's reliance on Molloy suggests the term's primary home is the seventeenth- and eighteenth-century maritime law tradition rather than general common law discourse. Researchers should not expect to find the phrase treated in general legal dictionaries of the period as a term of art carrying independent doctrinal weight — its function is descriptive shorthand for an established procedural device, not a term that itself generated legal rules.
What the historical dictionaries collectively miss, by omission, is the institutional trajectory: the *de medietate linguae* jury had a long history stretching back to medieval English statutes protecting alien merchants, and its abolition is part of the broader nineteenth-century rationalization of English civil procedure. That history is not recoverable from Burrill alone and requires the underlying treatise literature.
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Jurisdictional Note
The institution described — the *de medietate linguae* jury — was an English common law device with limited and uneven reception in American jurisdictions. American courts generally did not adopt it as a standard feature of practice. Researchers should not assume that the procedural context Burrill and Molloy describe transferred intact to any particular American jurisdiction.
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