Definition
Plegii (singular: plegius) is a Latin term from medieval and early common law meaning sureties or pledges — persons who bound themselves to guarantee the appearance or performance of another. The term appears most frequently in old writs, court records, and procedural forms where the names of sureties were required to be entered as a formal condition of obtaining process or release.
In practice, plegii were the named individuals standing behind a party's obligation: if the principal defaulted, the plegii were answerable. The term encompasses both bail sureties in criminal and procedural contexts and pledges of performance in civil matters.
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Common Confusion
PLEGII is sometimes loosely equated with MAINPERNORS or MANUCAPTORS, but the terms reflect distinct procedural mechanisms. Mainpernors took custody of a person and were responsible for producing them; plegii in the bail sense were sureties who answered for the party's appearance but did not necessarily take physical custody. The distinctions matter when reading medieval plea rolls or early common law forms, where the choice of term signals which procedural device was invoked.
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Why It Matters in Research
Researchers encounter plegii almost exclusively in pre-nineteenth-century sources: Year Books, plea rolls, early chancery records, and the formulary literature of the common law. By the time American and English legal practice modernized, the Latin terminology had been absorbed into anglicized equivalents — surety, bail, pledge — and plegii disappeared from operative legal language.
The term is a navigational marker in historical legal records. When transcribing or reading early writs, entries in plea rolls, or formulary books, the appearance of plegii signals that a surety arrangement was being recorded. The names that follow are those of the sureties themselves, not the principal party. Misreading these names as parties to the underlying dispute is a common transcription error.
In equity practice, the Rapalje & Lawrence source material for this entry cross-references pleading structure in Chancery — a reminder that Latin procedural vocabulary saturated equity forms long after it receded from common law pleading. Researchers working in early Chancery records should expect Latin surety terminology to persist alongside anglicized pleading terms well into the eighteenth century.
The term also surfaces in historical bail scholarship. Early bail practice required formal entry of plegii in the record; the transition to recognizance-based bail gradually rendered the named-surety form obsolete, but the old forms continued to appear in practice manuals and form books copied from earlier precedents long after the underlying doctrine had shifted.
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Historical Dictionary Support
Rapalje & Lawrence does not provide a freestanding entry for plegii as a substantive term. The appearance of the term in their source material is incidental — embedded in discussion of Chancery pleading forms and the procedural architecture of equity suits — which itself reflects how thoroughly the term had receded from active legal vocabulary by the late nineteenth century when that dictionary was compiled.
Earlier Latin-law glossaries and formularies are the natural home of plegii. Spelman's Glossarium (1687) and Du Cange's Glossarium Mediae et Infimae Latinitatis provide the richest historical treatment, tracing plegius through medieval continental and English usage. Cowell's Interpreter (1607) and Blount's Law Dictionary (1670) both treat the term in the context of surety and bail practice. What the nineteenth-century American dictionaries collectively miss is the procedural specificity: plegii is not simply a synonym for surety but a term tied to particular formal requirements in writ practice — the record had to name the plegii, and that naming had legal consequence.
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Jurisdictional Note
Plegii is a term of English and Anglo-Norman legal history. It has no operative role in modern American or English law. Researchers in Scottish legal history should note that Scots law preserved parallel Latin surety terminology through its own civilian-influenced tradition, and cognate terms appear in early Scottish court records under different procedural rules.
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