Definition
Mainpernors (singular: mainpernor) are persons who receive a prisoner from custody and bind themselves as sureties for that prisoner's appearance at a specified time and place. Unlike bail, mainpernors function as pure appearance sureties only: they guarantee the person will show up, nothing more.
The term is essentially obsolete in modern practice but appears with regularity in English legal history and early American common law materials.
Common Language
Modern common usage (Wiktionary): Defined simply as the plural of mainpernor, with no independent entry elaborating on meaning.
Historical common usage (Webster's 1913): Not separately defined in Webster's 1913 as a common English word; the term was always predominantly legal in character.
The word has no meaningful life outside legal contexts. Researchers encountering it in historical documents should treat it as a technical term of art requiring legal, not general, dictionary support.
Common Confusion
MAINPERNORS vs. BAIL (SURETIES): The distinction is structural and consequential. Bail sureties hold active custodial authority over the released party — they may re-arrest and surrender the principal before the appearance date if they choose to withdraw their undertaking. Mainpernors hold no such power. They are passive sureties: bound to produce the person at the appointed time, but without any right to seize or surrender him beforehand. Bouvier states this plainly: bail are sureties that the party be answerable; mainpernors are merely sureties for appearance at the day.
Conflating the two in historical research misreads the legal relationship and the degree of control exercised over the released individual.
Why It Matters in Research
This term follows a historical evolution pattern. It is a creature of English common law and appears primarily in sources predating the nineteenth century. Researchers working in colonial American records, early republic court documents, or English legal history will encounter mainpernors in proceedings involving pretrial release, recognizances, and surety arrangements.
The critical navigational point is the bail/mainpernor distinction. Early legal documents that specify mainpernors rather than bail are signaling a limited surety relationship — one without custodial power over the released party. Misreading this as equivalent to modern bail distorts the practical legal dynamic being recorded.
Bouvier's entry is truncated in the available source material, cutting off mid-sentence during the comparison with bail. Researchers should consult complete editions of Bouvier's for the full passage. The substance of the distinction — mainpernors as pure appearance sureties without surrender rights — is well established across historical sources even where Bouvier's text is incomplete.
The term has no surviving American statutory presence to speak of. It was not carried forward into modern bail and pretrial release statutes, which use the vocabulary of surety, bail bondsman, and recognizance without retaining the mainpernor category. Any modern appearance of the word in legal writing is either historical quotation or archaism.
Historical Dictionary Support
Bouvier's Law Dictionary is the primary historical authority available here and treats mainpernors as a recognized category of English law surety, distinct from bail proper. The key distinction Bouvier draws — that bail may imprison or surrender the principal while mainpernors may do neither — aligns with the classical common law treatment found in Blackstone and other institutional writers, who describe mainprise as a form of release on surety that predates and differs structurally from bail.
Historical dictionaries are generally consistent on the core distinction, though they vary in how much attention they give to the procedural context (writs of mainprise, the role of the sheriff, the offense categories for which mainprise was available versus bail). Bouvier's available text does not address these procedural details fully, and researchers needing that depth should consult Blackstone's Commentaries (Book IV) and older English treatises on criminal procedure.
What historical sources collectively miss or underemphasize: the gradual disappearance of mainpernors as a recognized procedural category during the eighteenth and nineteenth centuries and why bail subsumed the function entirely. The doctrinal absorption happened without much explicit commentary in the standard dictionaries.
Jurisdictional Note
Mainpernors as a live legal category existed in English common law and was transplanted in name to early American colonial and post-colonial practice. It did not survive as a distinct category in any American jurisdiction's modern statutory framework. Researchers working in English legal history will find it more operative and better documented than those working in American materials after approximately 1800.