Definition
A Latin phrase meaning "by twelve hands" or "a dozen hands." In medieval English law, duodena manu referred to the compurgation procedure in which a criminal defendant was required to produce twelve witnesses — compurgators — who would swear to his innocence or good character, thereby purging him of the offense charged. The term describes both the method and the required number of oath-helpers in this form of trial by oath.
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Common Confusion
Duodena manu is sometimes loosely conflated with compurgation generally, but the term is specifically tied to the twelve-witness requirement. Compurgation (wager of law) could, in some contexts, operate with fewer oath-helpers depending on the nature of the charge and the court. Duodena manu names the particular twelve-hand form. It should also be distinguished from the jury of twelve, which replaced compurgation over time and operates on entirely different principles: jurors assess facts, while compurgators merely swore to the defendant's credibility or innocence.
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Why It Matters in Research
This term appears almost exclusively in sources dealing with early medieval English criminal procedure and the gradual displacement of proof-by-oath by the common law jury system. Researchers will encounter it in treatises on Anglo-Saxon and early Norman law, and in secondary sources analyzing the transition from archaic modes of trial to the adversarial system.
A key navigational point: the historical dictionaries present this term in abbreviated, passing form. Black's (both editions) and Rapalje & Lawrence each offer only a one-line gloss. No substantive procedural detail is provided in the dictionary corpus itself. Researchers seeking how duodena manu functioned in practice — who qualified as a compurgator, how oath-breaking was handled, which offenses required the twelve-hand form — must look beyond the dictionary shelf to primary sources and jurisprudential histories.
The term's relevance today is entirely historical. It does not appear in modern statutory or case law contexts. Its research value lies in tracing the origins of evidentiary and criminal procedural concepts: the significance of twelve (which echoes in the twelve-person jury), the role of community standing in determining guilt, and the church's influence on early proof procedures.
Corpus researchers working on compurgation, wager of law, or the development of Anglo-American criminal procedure will find this term a useful anchor but must treat it as a pointer to deeper sources, not a destination in itself.
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Historical Dictionary Support
The three source dictionaries are in full agreement on the core definition: duodena manu means twelve witnesses used to purge a criminal of an offense. Black's (1st and 2nd editions) render it as "a dozen hands, i.e., twelve witnesses to purge a criminal of an offense." Rapalje & Lawrence gives the same substance in slightly fewer words and cross-references further treatment, though that cross-reference is truncated in the available text.
None of the three sources provide procedural context, historical examples, or citation to primary authority for the term's usage. The Digest references appearing in the same vicinity of Black's entries concern an unrelated maxim — Duorum in solidum dominium vel possessio esse non potest — and should not be read as authority for duodena manu itself.
What the historical dictionaries leave unaddressed is significant: they do not explain that compurgation was a procedure available in both ecclesiastical and secular courts, that its use in English common law courts was largely abolished by the nineteenth century, or that the requirement of twelve oath-helpers likely influenced — or at minimum paralleled — the eventual standardization of the twelve-person jury. Researchers should not assume the dictionary record is exhaustive on this point.
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Jurisdictional Note
Duodena manu is a creature of early English law with no surviving application in any modern common law jurisdiction. Compurgation as a formal procedure was effectively abolished in England by statute in the nineteenth century and was never transplanted in operative form to the American colonies or the United States.
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