Definition
An archaic Law French term meaning a deceiver or cheat. Used in early English legal texts to denote a person who commits deceit or fraud upon another. The term appears in historical pleading and treatise literature as a label for the perpetrator of a deceptive act rather than as a technical term of art with defined elements.
Common Language
This is pure legal-historical jargon with no surviving common English counterpart. The word does not appear in modern general usage. Omitted accordingly.
Why It Matters in Research
Researchers encountering *gylour* will find it almost exclusively in pre-modern English legal materials — particularly in Law French texts, early plea rolls, and medieval treatises predating the consolidation of fraud and deceit as distinct common law actions. Its appearance is a reliable signal that the surrounding text belongs to an early stratum of English legal thought, likely predating the mature action on the case for deceit.
The principal trap is terminological: a researcher focused on the history of fraud doctrine may overlook passages using *gylour* if searching only for modern equivalents such as "fraud," "deceit," or "misrepresentation." Corpus searches in Law Mind materials should include variant spellings — Law French orthography was inconsistent, and forms such as *gilour* or *gilor* may appear in different manuscript traditions or printed editions.
The term connects naturally to the historical development of the action of deceit and, further back, to the writ of *deceit* in English common law. Understanding *gylour* as a person-label (the deceiver) rather than a conduct-label (the act of deceiving) is important: medieval legal vocabulary often personified wrongdoing in ways that do not map neatly onto the later analytical separation of the wrongful act, intent, and harm.
Historical Dictionary Support
Burrill defines *gylour* tersely as "a deceiver," citing the *Fet Assaver* (§ 16), a medieval Anglo-Norman legal treatise. This is the sole entry in the Law Mind historical dictionary shelf for this term, and its brevity reflects the word's limited technical role: it functioned as a descriptive label rather than a term with elaborate doctrinal content.
No other shelf sources address *gylour*, which itself indicates how thoroughly the term passed out of active legal use. Historical dictionaries of Law French, such as Kelham's *Dictionary of the Norman or Old French Language*, provide the closest supplementary coverage for researchers needing fuller philological context. Burrill's citation to *Fet Assaver* is the most useful anchor point for primary-source investigation.
Jurisdictional Note
Applicable only to historical English law. The term has no counterpart in American, Scottish, or continental legal traditions and does not appear in any modern jurisdiction's statutes or case law.