Definition
In French and civil law, a mandataire is a person authorized by another — the mandant — to perform a specific act or series of acts on that person's behalf. The mandataire acts within the scope of authority granted by the mandate (mandat), a contract by which one person confers authority on another to act in their name. The concept is the civil law functional equivalent of what common law systems call an agent or mandatory.
The mandataire does not act on their own account; they act for and bind the mandant, provided they remain within the limits of the authority conferred. The governing maxim is direct: Mandatarius terminos sibi positos transgredi non potest — a mandatary cannot exceed the limits assigned to them.
Common Confusion
MANDATAIRE vs. MANDATARY: English legal sources sometimes render mandataire as "mandatary," which is the Anglicized form. These terms describe the same functional role but carry different contextual weight. Mandataire signals a civilian or French-law context; mandatary appears in older English and Scottish sources when discussing civil law concepts or ecclesiastical law. Researchers should not assume that every use of "mandatary" in historical common law texts refers to the same institution — the word also appears in Roman law discussions and in ecclesiastical contexts with overlapping but distinct meaning.
MANDATAIRE vs. MANDANT: The mandataire is the agent; the mandant (or mandator) is the principal who confers the authority. The distinction matters when tracing liability: acts within the mandate bind the mandant; acts exceeding the mandate may bind only the mandataire personally.
Why It Matters in Research
The term appears almost exclusively in sources dealing with French civil law, Louisiana law, Quebec law, and comparative civil law treatises. Researchers working in pre-20th century Louisiana materials will encounter mandataire frequently — Louisiana's civil law heritage means its agency law follows the mandat framework of the Code Napoléon rather than common law principal-agent doctrine.
Several traps arise in historical research:
First, the term is often left untranslated in English-language sources that discuss French or civil law. A researcher encountering mandataire in an 1850s Louisiana court opinion or treatise must understand it as a term of art, not a descriptive noun requiring independent construction.
Second, the scope limitation — the maxim Mandatarius terminos sibi positos transgredi non potest — was taken seriously in civil law jurisdictions in ways that sometimes diverged from common law apparent authority doctrine. Historical cases turning on whether an agent exceeded their mandate may have very different outcomes depending on whether the court applied civil or common law principles.
Third, Burrill's entry for mandataire is conspicuously thin, offering only the language designation and jurisdiction marker with no substantive definition. Researchers relying on Burrill alone for this term will receive no useful guidance and should cross-reference Black's or a specialized civil law dictionary.
For corpus researchers: connections run directly to the Law Mind materials on mandate, agency, Louisiana civil law, and the comparative treatment of principal-agent relationships. The term also surfaces in discussions of international private law and conflict of laws where French and common law systems interact.
Historical Dictionary Support
Black's first and second editions are in close agreement, offering the same core definition with minor textual differences in how the maxim is rendered. Both define mandataire as "a person employed by another to do some act for him" and equate the term with "mandatary." Both cite Jenk. Cent. 53 — Jenkins' Centuries of Reports — as authority for the limiting maxim.
The historical dictionaries treat the term as a simple cross-reference to the broader concept of mandate and mandatory, rather than developing the civil law institution in depth. This reflects a common limitation in 19th-century Anglo-American legal dictionaries: French and civil law terms were acknowledged but not fully explicated, because the primary audience was common law practitioners for whom these concepts were foreign law rather than operative doctrine.
What the historical sources do not address: the internal structure of the mandat contract under French law, the distinctions between mandat général and mandat spécial (general versus special mandate), or the liability rules governing an agent who exceeds their authority. Researchers needing this level of detail should look beyond the standard English-language legal dictionaries to civil law treatises and the French Civil Code commentaries.
Jurisdictional Note
The term is operative law in French-law jurisdictions, most notably France, Louisiana, and Quebec. In Louisiana, the mandat framework is codified in the Louisiana Civil Code (arts. 2989 et seq.), and the vocabulary of mandant and mandataire remains current in legal practice. Researchers moving between common law and civil law materials on agency questions should be alert to doctrinal differences that the shared vocabulary can obscure.