Definition
Pro perdere is a Latin legal phrase meaning "for to lose" or "in order to lose." It appears in medieval English legal contexts to describe a wager, pledge, or stake put up with the understanding that it may be forfeited — that is, placed at risk of loss. The phrase captures the obligatory exposure of something of value as a condition of a legal proceeding or wager, particularly in contexts where a party bound themselves to suffer a penalty or forfeiture upon a specified outcome.
Why It Matters in Research
This is a narrow, highly technical Latin phrase drawn from medieval legal procedure and appears primarily in early English legal sources. Researchers will encounter it almost exclusively in texts dealing with medieval pleading, trial by wager, and forfeiture mechanics — not in modern case law or statutes.
The sole primary anchor in the Law Mind corpus is the Fleta citation (lib. 6, c. 7, § 12). Fleta is a late thirteenth-century Latin treatise on English common law, heavily influenced by Bracton, and its language reflects procedural forms of that era. Researchers working with Fleta or similar treatises (Britton, Bracton, Glanvill) should treat pro perdere as context-specific vocabulary tied to wager-based proceedings — not as a freestanding doctrine with modern application.
Because the phrase is tied to the wager system, it connects naturally to research on trial by wager of law (compurgation) and wager of battle, both of which were formally abolished in England in the early nineteenth century. Any instance of pro perdere in a historical source signals proximity to those procedural forms and their associated concepts of pledge, surety, and forfeiture.
Researchers should be cautious: the phrase does not appear in standard modern legal dictionaries and has no direct equivalent in American law. Encountering it in a primary source is a strong indicator that the surrounding text is describing medieval English procedure, which may or may not map onto later doctrines the researcher is tracing.
Historical Dictionary Support
Burrill's Law Dictionary provides the only shelf-source entry for this term, offering a spare but accurate gloss — "for to lose" — with a single citation to Fleta. Burrill does not elaborate on the procedural context or connect the phrase to broader doctrine, which limits its utility as a research tool standing alone.
The Fleta reference is instructive precisely because Fleta addresses pleading and procedure in systematic form. In the cited passage, the phrase appears in connection with the mechanics of stakes or pledges in legal proceedings, reflecting the medieval practice of requiring parties to put something at risk as a guarantee of participation or outcome. This is consistent with the broader Latin legal vocabulary of the period, where pro constructions regularly described the purpose or condition of a legal act (pro querela, pro corpore, etc.).
No other historical dictionary in the standard research corpus — not Black's, not Bouvier's, not Tomlin's — carries an independent entry for pro perdere. Its absence from those sources underscores its status as specialized medieval procedural vocabulary rather than a term with sustained doctrinal life.
Jurisdictional Note
Pro perdere has no recognized application in modern American or Commonwealth jurisdictions. Its relevance is confined to historical English legal materials, principally Latin treatises of the thirteenth and fourteenth centuries.