Definition
Latin: "to defend oneself by one's own body." A formal legal phrase denoting the right of a party — typically a defendant in a criminal appeal or a civil dispute resolved by combat — to offer trial by battle as a mode of proof or defense. The party invoking this right wagered the outcome of the legal proceeding on personal combat, either fought directly or through a hired champion. The underlying theory was that divine providence would ensure the victory of the righteous party. The phrase encompasses both the offer of combat and the acceptance of that offer as a substitute for conventional judicial determination.
Common Confusion
Defendere se per corpus suum is sometimes loosely equated with the broader institution of trial by battle (wager of battle or battel) as a whole. The phrase is more precisely the formal act of tender — the procedural offer to resolve a matter by combat — rather than a synonym for the entire institution. A party who uttered this offer was making a specific legal plea that, if accepted, displaced ordinary evidentiary proceedings entirely.
Core Elements
The offer required: (1) a party with standing to make the challenge — originally a criminal appellant or the accused in an appeal of felony; (2) a formal tender in open court, typically accompanied by specified words and the casting of a glove or gauntlet; (3) acceptance by the opposing party or their champion; and (4) judicial sanction permitting the combat to proceed. Failure of any element could result in the court declining to award battle.
Why It Matters in Research
This phrase appears almost exclusively in historical sources predating the nineteenth century, and researchers encountering it in older English reports, plea rolls, or Year Books should understand that it signals a proceeding in the archaic mode of appeal of felony or wager of battle — not a metaphorical or rhetorical flourish. The institution was formally abolished in England by 59 Geo. III, c. 46 (1819), passed in the wake of Ashford v. Thornton (1818), in which the right to trial by battle was successfully pleaded in an appeal of murder, exposing the survival of the practice into the modern era and shocking Parliament into action.
For corpus researchers: the phrase is a red flag for the appeal of felony procedure, which operated entirely outside the indictment system and carried its own procedural logic. Finding this phrase in a record means you are likely dealing with a private criminal prosecution by an aggrieved party, not a Crown prosecution — a distinction that affects how the record was generated, where it was kept, and what procedural steps preceded and followed. It also signals that the proceeding may predate or operate parallel to the emergence of the common jury trial, making chronological context essential.
Researchers should not expect to find this phrase operative in American sources. The wager of battle was never formally adopted as part of American common law, and the phrase therefore functions in American legal writing, if it appears at all, only as historical reference or scholarly discussion.
Historical Dictionary Support
Black's Law Dictionary (2nd Ed., Supplemental) defines the phrase economically as "to offer duel or combat as a legal trial and appeal," directing readers to the entry for Battel. This is accurate but spare. The entry correctly identifies the statutory abolition (59 Geo. III, c. 46) without elaborating on the procedural mechanics that gave the phrase its legal force.
What the historical dictionaries do not supply is the institutional context: that the offer was embedded within the appeal of felony, a private prosecutorial mechanism with ancient roots; that the combat, if awarded, was governed by detailed rules of arms and judicial supervision; and that the availability of the wager varied depending on the nature of the charge and the status of the parties. Black's treatment, like most dictionary entries for archaic Latin maxims, preserves the definition without preserving the procedural world in which the phrase operated.
Jurisdictional Note
This phrase has no operative legal significance in any current jurisdiction. Its relevance is strictly historical and archival, confined to English legal proceedings prior to 1819 and to pre-modern legal systems that recognized trial by combat. American courts and legislatures never recognized wager of battle as part of the received common law.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Trial by Combat; Appeal of Felony; Wager of Law