Definition
A Latin genitive term meaning "of fraud" or "of deceit," appearing in Roman and civil law as part of compound phrases. In legal usage, *fraudis* is encountered almost exclusively as a grammatical component of Latin maxims and doctrinal phrases rather than as a standalone term. The most significant compound is *particeps fraudis* — a participant or partner in fraud; an accomplice to a fraudulent scheme.
As a standalone entry, *fraudis* derives from *fraus* (fraud, deceit, wrongdoing) and appears in constructions that qualify the nature of a participant's involvement or the character of an act. Its practical legal content is inseparable from these compound forms.
Common Confusion
*Fraudis* is not itself a legal concept but a Latin genitive modifier. Researchers encountering the term in historical sources are almost certainly reading a fragment of a longer phrase — most commonly *particeps fraudis* — and should not treat *fraudis* alone as carrying independent doctrinal weight. The term should be distinguished from *fraus* (the nominative form, used as a subject or standalone concept) and from the English term "fraud," which carries a fully developed independent legal meaning in common law systems.
Core Elements
Because *fraudis* functions primarily through the phrase *particeps fraudis*, the operative concept is best understood through that compound:
PARTICEPS FRAUDIS — A partner in crime or fraud; an accomplice. The concept requires:
1. A principal fraudulent act or scheme in existence
2. Knowing participation by the party characterized as *particeps fraudis*
3. Some degree of complicity — presence, assistance, or shared purpose — connecting the participant to the fraud
The degree of participation required to constitute *particeps fraudis* was contested in equity and varied by context, particularly in cases involving the enforcement of instruments tainted by fraud.
Why It Matters in Research
Researchers working in equity, civil law, or early common law materials will encounter *fraudis* almost exclusively in one of two contexts: Latin maxims reproduced in treatises and digests, or as part of *particeps fraudis* in chancery and equity opinions addressing whether a third party to a fraudulent transaction could take the benefit of that transaction.
The critical research trap is treating *fraudis* as an index term. Historical digests and legal dictionaries (including Rapalje & Lawrence) sometimes list it as a headword, but the substantive doctrine lives under ACCOMPLICE, COMPLICITY, FRAUD, or PARTICEPS FRAUDIS. A researcher who stops at the *fraudis* entry and does not follow through to *particeps* will miss the applicable case law.
The equity dimension matters most. Courts in chancery used *particeps fraudis* to deny relief to plaintiffs who had themselves participated in the fraud underlying the transaction they sought to enforce or unwind. This principle — that equity will not assist a *particeps fraudis* — overlaps with but is not identical to the clean hands doctrine and the in pari delicto defense. The doctrines converge in many opinions, and historical sources do not always distinguish them carefully.
The maxim cited by Rapalje & Lawrence — *Participes plures sunt quasi unum corpus* (from Co. Litt. 4) — is drawn from the law of coparcenary, not from fraud doctrine. Its appearance in the same entry reflects the dual meaning of *particeps* (one who shares or participates, whether in property or in wrongdoing). Researchers must note which sense is operative in their source.
Historical Dictionary Support
Rapalje & Lawrence treat *fraudis* as a brief cross-reference entry, directing readers to ACCOMPLICE and then immediately pivoting to a use of *particeps* in a testamentary context (L.R. 6 Ch. 696) and the coparcenary maxim from Coke. The entry reflects the dictionary's characteristic method of bundling Latin roots with related doctrines that share vocabulary but not necessarily legal substance.
The shift from *particeps* as a property concept (coparceners sharing a single right in land) to *particeps fraudis* as a complicity concept illustrates how Roman and civil law terminology was absorbed into English equity with altered meaning. Coke's usage concerns inheritance and seisin; the equity usage concerns moral taint in a transaction. Historical dictionaries that reproduce the coparcenary maxim alongside the fraud meaning without distinguishing them can mislead researchers into thinking the two concepts are doctrinally linked. They are not — beyond the shared Latin root.
No single authoritative historical dictionary gives *fraudis* extended independent treatment. The term functions as infrastructure for other entries rather than as a self-contained concept.
Jurisdictional Note
The *particeps fraudis* principle operated across equity jurisdictions in England and the United States, but its precise effect — whether it bars all relief or merely discretionary equitable relief — varied by court and era. Civil law systems retain the Latin framing more explicitly; common law systems absorbed the substance under in pari delicto and clean hands without always preserving the Latin label.
Encyclopedia Cross-Reference
See: FRAUD; COMPLICITY; IN PARI DELICTO