Definition
In Roman and civil law, conductio is the act of hiring — the taking or receiving of a thing under a lease or contract of hire. The term appears almost exclusively in conjunction with its counterpart, locatio (a letting), forming the paired expression locatio et conductio, sometimes written as the compound locatio-conductio. Together, these terms describe the bilateral Roman law contract in which one party (the locator) lets out property, labor, or a task, and the other party (the conductor) takes it in exchange for a fixed price or rent (merces).
The conductor is the hirer — the party who receives the use of a thing, the services of a person, or the completion of a piece of work. The locator is the letter or lessor. Because the relationship is reciprocal and indivisible in Roman legal thinking, conductio rarely appears without locatio; the full contract is locatio-conductio.
Recognized Forms
/SUBTYPES
Roman jurists recognized three functional varieties of locatio-conductio, each distinguished by what was let and hired:
Locatio-conductio rei: the letting and hiring of a thing — closest to the modern lease of property or goods. The locator delivers possession of a physical object; the conductor pays rent for its use.
Locatio-conductio operarum: the letting and hiring of services or labor. A free person lets out their own labor to a conductor who pays wages. This form is the Roman ancestor of the employment contract.
Locatio-conductio operis (also operis faciendi): the letting and hiring of a piece of work or a result. The conductor (here acting more like a modern contractor) undertakes to produce a finished outcome — a building, a transported cargo, a garment cleaned — rather than ongoing labor. The locator pays upon completion.
Why It Matters in Research
Conductio is a civil law term with no direct common law equivalent. Researchers encounter it primarily in three contexts: Roman law scholarship and institutional texts, treatises on bailment and contract that trace civilian influence on English and American law, and comparative law sources examining lease and employment doctrine.
The most important navigational point is that conductio cannot be understood in isolation. Every index entry, cross-reference, and treatise discussion of conductio will lead to locatio and to locatio-conductio as the operative concept. Searching only for conductio in historical sources will recover partial results; the compound form locatio-conductio is the standard entry point.
Story's Bailments is a key corpus connection. Story explicitly treated locatio-conductio as foundational to Anglo-American bailment classification, and his sections on the topic (cited in Black's 2nd edition) are the primary channel through which this Roman taxonomy entered English-language legal literature. Researchers tracing the doctrinal ancestry of American bailment, lease, or service contract law will find conductio discussed there in detail.
Bracton's use of locatio-conductio (fol. 62) is also significant: it signals the term's presence in medieval English legal writing, though Bracton's treatment is derivative of Roman and canon sources rather than reflective of active English practice. Do not read Bracton's citation of these terms as evidence of a functioning Roman hire contract in 13th-century English courts.
For researchers working in Louisiana, Quebec, or other mixed civil law jurisdictions, conductio and its subtypes have greater doctrinal vitality. The civilian lease and service contract traditions in those jurisdictions draw directly on locatio-conductio taxonomy in ways that pure common law jurisdictions do not.
Historical Dictionary Support
Black's 1st and 2nd editions agree precisely: conductio is a hiring, used in connection with locatio, forming locatio-conductio. The 2nd edition adds the Institutes (3.25), Bracton, and Story citations, which is the more useful entry for research purposes.
Burrill's entry is fragmentary in the available text, providing only the Latin derivation note (from conducere, to lead or bring together, hence to hire). This etymological grounding is consistent with the functional meaning: the conductor brings together an agreement to take something in hire.
None of the historical dictionary sources fully explains the three-part taxonomy of locatio-conductio subtypes. Researchers relying solely on Black's or Burrill's entries will have an accurate but incomplete picture. For the subtype distinctions, the Institutes of Justinian (3.25) and Gaius (Institutes 3.142–147) are the primary sources; Story's Bailments provides the most accessible English-language synthesis.
Jurisdictional Note
Conductio as a live doctrinal term is largely confined to civil law jurisdictions and comparative law scholarship. In common law jurisdictions, it survives only as historical background for lease, bailment, and service contract doctrine. Louisiana's Civil Code lease provisions (arts. 2668 et seq.) reflect the locatio-conductio tradition most directly among American jurisdictions.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Locatio-Conductio; Bailment; Lease (Civil Law Origins)