Definition
Ad campi partem is a Latin phrase meaning "for a share of the field or land." In legal usage, it is a descriptive term for champerty — the practice by which a person who has no legitimate interest in a lawsuit finances or assists a litigant in exchange for a portion of any land or property recovered in the action. The phrase captures the original, agrarian context of champerty, where the bargained-for consideration was literally a share of disputed land rather than a monetary percentage of proceeds.
Common Confusion
Ad campi partem is occasionally treated as a synonym for maintenance, but the two are distinct. Maintenance is the broader offense of improperly supporting another's litigation; champerty is a specific, aggravated form of maintenance in which the supporter bargains for a share of the recovery. Ad campi partem points specifically to the champertous bargain — the share-for-support arrangement — not to the mere act of meddling in litigation.
Why It Matters in Research
This term surfaces almost exclusively in older common law sources and treatises dealing with champerty and maintenance. Researchers are unlikely to encounter it in modern case law or statutes, where "champerty" has entirely supplanted it. Its value in corpus research is diagnostic: its presence in a document signals engagement with the classical common law doctrine of champerty as understood through medieval and early modern English legal writing, particularly the tradition running through Fleta and similar juristic compilations. If you encounter ad campi partem in a historical source, the immediate research move is to the surrounding doctrine of champerty — the term itself is descriptive shorthand for the forbidden bargain, not a standalone cause of action or offense with its own procedural framework. Researchers working on the history of litigation finance, champerty reform, or the erosion of maintenance doctrine in American jurisdictions should note that this Latin formulation disappeared from American legal usage well before the twentieth century, even as the underlying doctrine persisted (and was eventually relaxed in many states). Its absence from later sources is itself informative.
Historical Dictionary Support
All four source dictionaries are in close agreement. Black's (both editions), Bouvier's, and Burrill's each render the phrase as "for a share of the field or land, for champert," with only minor variation in phrasing. All four trace the phrase to the same source: Fleta, lib. 2, c. 36, § 4 — a late thirteenth-century English legal treatise written in the tradition of Bracton. This uniformity reflects the narrow, derivative function of the entry: the dictionaries are essentially glossing a Latin phrase found in a single authoritative historical source rather than synthesizing a body of evolving case law.
Burrill adds a small but useful clarification, inserting the parenthetical "ut particeps fiat" — "so that he may become a participant" — which makes explicit that the phrase describes the champertor's motive or objective in the transaction. This addition is absent from the other entries and is the most analytically precise formulation among the four. None of the historical dictionaries offer extended discussion of ad campi partem independent of champerty, confirming that the phrase was understood as a descriptor rather than a term of art with its own doctrinal life.
Researchers should note that none of the dictionary entries provide English case law references or statutory grounding beyond Fleta. The phrase is rooted in the juristic literature of medieval England and was carried into American legal dictionaries as a learned latinism rather than as a term in active professional use.
Jurisdictional Note
Ad campi partem has no modern jurisdictional application. It is a historical Latin formulation tied to English common law. The underlying doctrine — champerty — varied significantly across American states, with some abolishing it entirely and others retaining modified versions. The phrase itself is not operative in any current American or English jurisdiction.