Definition
Latin: "purchase and sale." The name given in Roman law to the consensual contract of sale — the agreement by which one party (the vendor) transferred ownership of a thing to another (the buyer) in exchange for a price (merx and pretium). The contract was complete upon agreement on the object and price, without requiring physical delivery or written formality. Emptio et venditio is the Roman law ancestor of the modern contract of sale and underlies much of the civilian law tradition governing commercial transactions. Also written as a compound: emptio-venditio.
Common Confusion
Emptio et venditio is sometimes encountered alongside emptio spei (purchase of a hope, as in the purchase of a future catch of fish) and emptio rei speratae (purchase of an expected thing). These are specialized Roman law subcategories of the sale contract, not synonyms. Researchers encountering any of these terms in historical sources should not treat them as interchangeable. Additionally, emptio alone means purchase or buying, while venditio alone means sale or selling; the compound captures the bilateral nature of the transaction.
Why It Matters in Research
This term appears almost exclusively in historical and comparative legal sources rather than modern case law, making it primarily a research term for those working in Roman law foundations, civilian jurisdictions, or the intellectual history of contract law.
Researchers tracing the development of sale law in common law jurisdictions will encounter emptio et venditio in treatises and commentaries that predate or run parallel to the emergence of English sale doctrine. Bracton's use of the term (fol. 61b, cited in both Black's and Burrill's) is significant: Bracton drew heavily on Roman and canon law, and his treatment of sale reflects the Roman consensual model rather than any purely English framework. This creates a potential interpretive trap — a researcher reading Bracton or Fleta on sale must account for the Roman conceptual apparatus those texts import, which does not map cleanly onto later common law categories of contract formation, consideration, or conveyance.
In the Law Mind corpus, this term connects outward in two directions: backward into Roman law sources (the Institutes, the Code, Heineccius) and forward into civilian-influenced jurisdictions such as Scotland, Louisiana, and Quebec, where sale doctrine retains structural features inherited from Roman law. Researchers working in mixed jurisdictions should note that the Roman model treated the contract as complete on consent, with the risk of the thing (periculum) passing to the buyer at that moment even before delivery — a rule that diverges sharply from common law approaches that tied risk more closely to property transfer or possession.
The Fleta citation in Burrill's (lib. 2, c. 58) places this term within the stream of English legal literature that absorbed Roman categories while English common law was still forming. That absorption was incomplete and contested, which is precisely why understanding emptio et venditio as a Roman law concept — rather than as an English one with Latin packaging — matters for accurate historical research.
Historical Dictionary Support
Black's and Burrill's entries are in close agreement and both brief. Both translate the term as "purchase and sale," note the alternative rendering "emption and vendition," identify it as the Roman law name for the contract of sale, and cite Bracton fol. 61b. Burrill's entry is marginally more expansive in its citation trail, adding the Institutes (lib. 3, tit. 24), the Code (4, 38), Fleta (lib. 2, c. 58), and Heineccius's Elementa Juris Civilis — the last being a standard 18th-century systematization of Roman private law that was widely used in legal education on the Continent and in civilian-influenced common law jurisdictions.
What both entries omit is any substantive treatment of how the Roman contract actually functioned — the role of consent, the rules on price, the periculum rei venditae doctrine, or the ways this model influenced (and where it diverged from) English sale doctrine. Neither dictionary entry is intended as an exposition of Roman law; they are cross-reference anchors for researchers encountering the phrase in a text. The researcher who needs to understand the doctrine, not merely the label, must move immediately to the primary Roman sources and to commentators such as Heineccius, Pothier, or Gaius.
The appearance of what appears to be a corrupted or run-together passage at the end of the Burrill's source text (referencing emphyteuticarium and Hallifax's Analysis) suggests a scanning or transcription artifact from the original printed volume. Researchers using digitized versions of Burrill's should be alert to such errors and consult the original where citations are unclear.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Contract of Sale (Roman Law); Consensual Contracts; Bracton and Roman Influence on English Law