Definition
A person caught in the act of wrongdoing while in possession of the incriminating instrument or evidence. The term derives from the concept of being taken "in the mainer" — that is, discovered with the means or product of an offense in hand. In its specific evidentiary application, when a libel is produced written in a person's own hand and authorship is otherwise unknown, that person is said to be taken in the mainer, which shifts the burden of proof onto them to disprove authorship or liability.
The term is archaic and appears almost exclusively in historical legal sources. It is not in active use in modern legal practice or pleading.
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Common Language
Modern common usage (Wiktionary): A surname transferred from the given name; no connection to any legal concept.
Historical common usage (Webster's 1913): Not recorded as an independent entry; the concept was embedded in the phrase "taken in the mainer" or variants thereof.
The gap here is complete: the surname "Mainer" and the legal term share no relationship whatsoever. A researcher encountering "mainer" in a historical legal document should not treat it as a proper noun or personal reference. It signals instead a procedural or evidentiary posture — the equivalent of being caught red-handed in a way that carries legal consequence.
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Common Confusion
MAINER / MAINOUR: These terms are closely related but not identical in historical usage. MAINOUR refers most commonly to stolen goods found on a thief at the time of apprehension — a concept with deep roots in common law criminal procedure. MAINER, as Anderson uses it, applies the same burden-shifting logic to the authorship of a defamatory document. The evidentiary principle is the same; the context differs. Researchers should not assume MAINER is simply a misspelling of MAINOUR, nor that MAINOUR authorities directly govern the libel context without further analysis.
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Why It Matters in Research
Researchers working in early English legal sources, ecclesiastical records, or historical defamation and libel proceedings may encounter "mainer" or "taken in the mainer" without any explanatory context. The term belongs to an older layer of evidentiary doctrine in which physical possession of an instrument — a document, a weapon, stolen goods — created a presumptive or burden-shifting effect against the possessor.
In the libel context specifically, "taken in the mainer" served a functional purpose in an era before reliable forensic authorship analysis: if a defamatory writing was produced in the defendant's own hand and no other author was identifiable, the physical fact of the handwriting itself operated as prima facie evidence against the possessor, placing the onus on them to explain or rebut. This is a meaningful procedural concept for researchers tracing the history of burden-shifting in defamation law or early evidence doctrine.
The term does not appear in modern legal databases under this spelling or usage. Searches should include variant spellings and the parent phrase "in the mainer" or "mainour" — the latter being the more commonly indexed form in legal dictionaries and historical sources.
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Historical Dictionary Support
Anderson's Dictionary of Law is the sole source in the Law Mind corpus for this term, and its treatment is brief: it refers the reader to the parent entry MAIN and supplies a single illustrative example involving a libel produced in the author's own hand. Anderson treats the burden-shifting effect as the operative legal consequence, not the act of being caught itself.
The concept is more fully developed under the related term MAINOUR (also spelled MAYNOUR or MANOR in some historical sources), which appears in Blackstone and other common law authorities in connection with theft — a thief taken "with the mainour" meaning a thief apprehended while still carrying the stolen goods. Anderson's MAINER entry is essentially a narrow evidentiary application of that older common law concept, transplanted from theft doctrine into defamation procedure.
Historical dictionaries that omit MAINER as a standalone entry are not deficient; the term is properly subordinate to MAINOUR and to older Latin and French root forms. Researchers who find only MAINOUR in their sources should understand that MAINER is the same conceptual lineage applied to documentary evidence rather than physical goods.
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