Definition
A condictio ex lege is a personal action from Roman civil law that arose when a legal obligation existed but no specific form of action had been designated to enforce it. Where a statute or legal rule created a right or duty without providing a named remedy, the condictio ex lege served as the gap-filling mechanism — a general personal claim that could be brought to vindicate the obligation the law had created.
The term translates literally as "action arising from law" or "claim from statute." It belongs to the broader Roman law family of condictiones — personal actions seeking recovery of a specific thing or sum — but is distinguished from other condictiones by its triggering condition: not an unjust enrichment, theft, or promise, but a naked statutory obligation without an assigned procedural vehicle.
Why It Matters in Research
This term appears almost exclusively in historical common law and civil law scholarship. Researchers will encounter it in treatises on Roman law foundations, in equity discussions borrowing civilian concepts, and in older American and English cases where counsel or courts were reaching for a civilian framework to justify a remedy the common law had not yet developed.
The critical research intelligence here is the gap-filling function. When you see condictio ex lege in a historical source, the author is typically arguing that a legal obligation exists but that no named writ or action covers it — an argument with direct parallels to the development of quasi-contract and unjust enrichment doctrine in common law systems. Understanding this term helps trace how equity courts and later common law courts absorbed the logic of the condictio system without always naming it explicitly.
Researchers using Burrill's entry will find the most substantive historical guidance: Burrill locates the term in the Digest (Dig. 13.2) and Code (Cod. 4.9), cites Heineccius's Elementa Juris Civilis, and references Hallifax's Analysis of the Civil Law. Black's and Bouvier's are far thinner, essentially paraphrasing the same one-sentence definition. If depth is needed, Burrill is the starting point; the civilian sources he cites are the next step.
Be alert to the distinction between condictio ex lege and the broader condictio indebitati. Bouvier's entry for condictio ex lege appears immediately adjacent to the entry for indebitati, and the manuscript cuts off mid-sentence, suggesting either a typographical artifact or an editorial conflation in some editions. Do not assume Bouvier treats these as synonymous.
Historical Dictionary Support
All three shelf sources converge on the core definition: an action arising where law created an obligation but provided no express form of action. The agreement is nearly verbatim because all three are drawing from the same civilian authority — identified in Black's and Bouvier's as "Calvin" (Johannes Calvinus, Lexicon Juridicum, a standard reference in early modern legal dictionaries).
Burrill adds the most analytical value. He distinguishes the condictio ex lege as specifically tied to obligations introduced by new law — meaning later legislation that outpaced the existing system of named actions — rather than any law generally. This is a meaningful clarification: the action was a procedural response to legislative innovation, not simply a catch-all for statutory claims. His citations to the Digest and to Heineccius provide the Roman law scaffolding the other dictionaries omit entirely.
What the historical dictionaries collectively miss is any account of how this civilian concept migrated into common law reasoning. None of the three sources discuss the condictio ex lege in the context of English equity, quasi-contract, or the later law of restitution, even though the functional logic is closely related. Researchers tracing doctrinal genealogy will need to go beyond the dictionary shelf.
Jurisdictional Note
The condictio ex lege is a civil law concept with no direct common law equivalent, though its logic influenced the development of quasi-contractual and restitutionary remedies in both English and American courts. It remains a working concept in modern civilian jurisdictions (notably Scotland, South Africa, and Louisiana) that preserved Roman law foundations. In purely common law jurisdictions, the term appears almost exclusively in historical or comparative law contexts.