Definition
An actio ex stipulatu is a Roman civil law action brought to enforce a stipulatio — the formal oral contract of Roman law, concluded by a question and affirmative answer between the parties. Where a party made a binding promise under the stipulatio form and failed to perform, the other party could bring this action to compel performance or obtain damages for non-performance.
The term is Latin: actio (action, lawsuit) ex (from, out of) stipulatu (the stipulation). It belongs to a family of named Roman actions, each tied to a specific legal source of obligation.
Common Confusion
Actio ex stipulatu is sometimes conflated with the actio stricti juris, a related but distinct concept. Bouvier's entry for actio ex stipulatu bleeds directly into its definition of actio stricti juris without a clear break — a layout artifact that has caused researchers to treat the two as connected or overlapping terms. They are not the same thing. Actio ex stipulatu identifies the source of the obligation being enforced (a stipulation). Actio stricti juris describes the interpretive method the judge used when administering certain actions — following the formula strictly, granting only what the pleadings strictly warranted, without equitable flexibility. Many stipulation-based actions were stricti juris actions, but the two categories operate on different axes and should not be conflated.
Why It Matters in Research
This term appears almost exclusively in Roman law and civil law contexts. Researchers will encounter it in historical treatises on Roman procedure, in scholarship on the development of contract law, and occasionally in Louisiana, Quebec, and Scottish legal sources where the civilian tradition persisted into modern law.
The primary research trap is the Bouvier's layout problem noted above. Editions of Bouvier's that run actio ex stipulatu and actio stricti juris in the same paragraph have caused secondary sources to misattribute characteristics of the stricti juris action to the stipulatu action specifically. When following a citation chain that relies on Bouvier's for either term, verify whether the source has correctly separated the two definitions.
A second trap involves the word "stipulation" itself. In modern common law practice, stipulation means an agreement between parties or counsel, often procedural. In Roman law, stipulatio was a highly formal, oral, question-and-answer contract with specific requirements for validity. The actio ex stipulatu enforces the Roman form, not the modern procedural agreement. Sources that translate loosely from Latin into English can obscure this distinction.
Researchers working in comparative law or legal history will find this term most useful as a marker: its presence in a source signals civilian influence and Roman procedural framework. It connects the law of obligations to the law of actions in the Roman system, a linkage that shaped later civil law codifications in France, Louisiana, and elsewhere.
Historical Dictionary Support
Both Black's and Bouvier's define actio ex stipulatu in near-identical terms: an action to enforce a stipulation. Neither entry is expansive. Black's offers the definition alone. Bouvier's adds citations to Abbott and to Hunter's Roman Law, the latter being a substantive secondary source on Roman legal procedure that would repay direct consultation for researchers needing depth beyond the dictionary gloss.
Neither historical dictionary explains the requirements of the underlying stipulatio, the procedural mechanics of bringing the action, or the distinction between this action and other contract-enforcement actions in Roman law such as the condictio. For that context, researchers should go to primary treatise sources — Hunter's Roman Law and Sohm's Institutes of Roman Law are the standard English-language starting points. The historical dictionaries are useful only as a first pointer; they do not provide sufficient information to understand the term in operation.
Jurisdictional Note
Actio ex stipulatu is a Roman law term with no direct modern common law equivalent. Its continuing relevance is primarily in jurisdictions with civil law heritage — Louisiana, Quebec, and Scotland — where Roman law concepts survived into codified or mixed legal systems. In pure common law research, the term appears only in historical or comparative contexts.