Definition
Actio ex empto (also written actio empti or actio emti) is a civil law action available to a buyer against a seller. It empowers the buyer to compel the seller to deliver possession of the thing sold, together with its titles, fruits, and all appurtenances dependent upon it. The action arises from the contract of sale and gives the purchaser a remedy not merely for delivery of the physical object but for everything the seller is obligated to transfer under that agreement.
The term translates literally as "action out of purchase" or "action upon a purchase." It is the buyer's counterpart to the actio ex vendito, which runs in favor of the seller against the buyer.
Why It Matters in Research
This is a Roman and civil law term with no direct common law equivalent. Researchers working in early American, Louisiana, Quebec, or other mixed-jurisdiction sources will encounter it most often in treatises on the law of sales and in courts applying or analogizing civil law principles. It appears with some frequency in nineteenth-century American legal writing as commentators worked to reconcile civil and common law sales doctrine.
The phrase actio ex empto, actio empti, and actio emti are used interchangeably across sources. Burrill explicitly flags the equivalence. Researchers searching historical databases should run all three forms; inconsistent transcription of Latin abbreviations in digitized sources may further complicate retrieval.
The scope of the action matters for research into vendor obligations: the action covered not just the object itself but its fruits (income, produce, offspring generated between sale and delivery) and its titles (documentary evidence of ownership). This breadth influenced later civil law discussions of what a seller owes at the moment of performance and is relevant to historical disputes over crops, rents, and encumbrances discovered after contract but before delivery.
Researchers consulting Pothier's Treatise on the Contract of Sale — cited by Burrill — will find the most sustained treatment of this action in a source that American courts and commentators treated as authoritative well into the nineteenth century. Justinian's Institutes (4.6.28) and Digest (19.1) are the primary Roman sources; the Codex (4.49) provides the later imperial treatment. Heineccius's Elementa Juris Civilis is a useful eighteenth-century synthesis cited in the same passage.
Historical Dictionary Support
Bouvier's entry is spare — "an action of purchase, or upon purchase" — and offers no elaboration on scope or procedure. It serves identification purposes only.
Burrill's entry is substantially more useful. It supplies the full functional description (delivery of possession, titles, and fruits), identifies Pothier as the governing treatise authority, and cross-references the primary Roman law texts. Burrill also flags the terminological equivalents actio empti and actio emti, which Bouvier does not address.
Neither source addresses the procedural mechanics of how the action was pleaded in practice, its limitation period, or how American or Louisiana courts adapted it. For that material, researchers must go beyond the dictionary shelf to Pothier directly, to Story's Commentaries on the Law of Sales, or to Louisiana Supreme Court opinions from the antebellum period, where civil law sales doctrine was actively litigated.
Jurisdictional Note
This action has no independent existence in common law jurisdictions, where the law of sales developed along distinct lines through contract and property doctrine. It remains analytically relevant in Louisiana and other civil law or mixed jurisdictions, where it informs the historical understanding of a seller's obligations at delivery.