Definition
A contract from Roman civil law in which one party (the mandans) entrusts another (the mandatarius) with the performance of a task or service, and the mandatarius undertakes to perform that service gratuitously — that is, without expectation of compensation. The absence of remuneration is the defining characteristic of mandatum and distinguishes it from other service arrangements in which payment is given or expected.
Mandatum is the Latin root of the modern common law concept of mandate and is the direct ancestor of the agency and gratuitous bailment doctrines absorbed into Anglo-American law through civilian influence. The term appears in legal sources primarily in its Latin form when writers are discussing Roman law directly; English-language successors use "mandate" or "gratuitous agency."
Common Confusion
Mandatum is frequently treated as interchangeable with "mandate" in historical sources, but the terms occupy different levels of abstraction. Mandatum refers specifically to the Roman civil law contract and its precise doctrinal structure. "Mandate" in modern common law usage is broader and less technically constrained — it encompasses agency relationships that may or may not be gratuitous and carries additional constitutional and statutory meanings (as in a legislative mandate or an appellate court's mandate to a lower court). Researchers encountering mandatum in a text are in Roman law or civilian-influenced territory; encountering "mandate" alone may be in any of several unrelated doctrinal contexts.
Mandatum should also be distinguished from mandamus. Mandamus is a writ of public law compelling a governmental officer to perform a ministerial duty; mandatum is a private law contract of gratuitous service. The verbal similarity has caused confusion in older secondary sources. The Anderson's Dictionary entry in the source material above conflates the two by partially describing mandamus under this heading — a copyist or editorial error that illustrates exactly the kind of trap researchers encounter in historical dictionaries.
Core Elements
The classical mandatum required the following:
1. Agreement: The mandans requests, and the mandatarius accepts, a charge or commission to act on the mandans's behalf.
2. Gratuity: The mandatarius performs without remuneration. If payment was involved, the arrangement fell under a different Roman contract type (locatio conductio operarum). The gratuitous character is essential, not incidental.
3. Action for the benefit of the mandans (or a third party): The mandatarius acts in the interest of the mandans, not for the mandatarius's own account.
4. Personal obligation: The duty runs between the specific parties; performance is not freely transferable.
Why It Matters in Research
Researchers will encounter mandatum most frequently in three contexts: (1) historical treatises on Roman law or civil law systems; (2) early American and English works on bailment, particularly Story's Commentaries on the Law of Bailments and Kent's Commentaries, which use mandatum to frame the gratuitous bailment category; and (3) comparative law scholarship tracing agency doctrine to its civilian roots.
The gratuity requirement is the most research-critical concept. When Story, Kent, and their contemporaries define the gratuitous aspect of certain bailments, they are drawing directly on the mandatum structure. Losing sight of this lineage causes confusion when reading nineteenth-century cases that invoke mandatum or "mandate" as authority for propositions about compensated agency — because the civilian rule applied only to uncompensated service.
The Anderson's entry in this corpus is corrupted: it describes mandamus, not mandatum, in its substantive text. Researchers relying on Anderson's for this entry will be misled. Cross-check against Burrill, which gives the correct and most complete treatment among the historical dictionaries surveyed here.
Jurisdictional variation matters less here than temporal and systemic variation. Mandatum as a doctrinal term of art belongs to civil law systems and to the historical common law period when civilian learning was directly imported. Modern common law jurisdictions have absorbed the underlying concepts into agency and bailment law without retaining the Latin terminology in operative legal texts.
Historical Dictionary Support
Burrill provides the most substantive and accurate entry among the sources consulted. He correctly identifies the two parties (mandans and mandatarius), states the gratuitous character as the operative feature, and cites the institutional sources: Justinian's Institutes (3.27), the Digest (17.1), and the Code (4.35), alongside Kent's Commentaries and Story on Bailments. This is the entry that rewards close reading.
Black's (both editions) dispatches the term with a single cross-reference to "mandate," which is adequate for orientation but provides no doctrinal content. Bouvier similarly cross-references without elaboration. Rapalje & Lawrence routes the reader to bailment. These entries are consistent with each other and with Burrill in treating mandatum as foundational to the bailment category, but none approaches Burrill's depth.
The Anderson's entry, as noted above, is a substantive error — the text describes mandamus. This is a notable failure in an otherwise useful dictionary and should be flagged whenever Anderson's is used as a primary source for this term.
No historical dictionary in this corpus adequately addresses the transition from mandatum to modern agency doctrine or explains why the gratuity requirement was progressively de-emphasized as common law agency developed. That doctrinal evolution requires sources beyond these dictionaries.
Jurisdictional Note
Mandatum as a term appears in operative legal usage primarily in civil law jurisdictions (Louisiana, Quebec, and civilian-influenced systems), where mandate remains a recognized contract category in positive law. In common law jurisdictions, the underlying doctrine survives in agency and gratuitous bailment but the Latin term has no operative legal force.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Bailment; Agency; Mandate