Definition
Furtum (Latin: theft) is a term drawn from Roman civil law denoting the wrongful taking or handling of another's property with fraudulent intent and for the purpose of gain. The concept is broader than simple physical taking: it encompasses not only the removal of an item but also the unauthorized use (furtum usus) or unauthorized assumption of possession (furtum possessionis) of property belonging to another.
The classical Roman formulation, preserved in the Institutes and Digest of Justinian, defines furtum as the fraudulent handling or meddling with a thing — including its use or possession — for the sake of making gain, without the consent of the owner. This tripartite reach (the thing itself, its use, its possession) distinguishes furtum from narrower common-law conceptions of theft, which historically required a taking and carrying away.
In English legal sources, furtum appears primarily as a term of art in medieval common law texts drawing on Roman and canon law traditions, and later as a historical reference point in discussions of larceny and theft.
Common Confusion
Furtum is sometimes read as a precise Roman-law equivalent of the common-law crime of larceny. The equivalence is imperfect. Larceny at common law required a trespassory taking and asportation (carrying away) of tangible personal property. Furtum, by contrast, did not require physical removal — unauthorized use of a borrowed item could constitute furtum usus even when the object never left the possessor's hands. Researchers treating furtum as synonymous with larceny will misread sources discussing unauthorized use or unauthorized retention as something less than theft when, under the Roman framework, it was precisely that.
Recognized Forms
/SUBTYPES
Furtum manifestum. Theft in which the thief is caught in the act — apprehended at the scene or before reaching a place of safety with the stolen goods. Roman law imposed heavier penalties on manifest theft than on non-manifest theft.
Furtum nec manifestum. Theft not discovered in the act; the ordinary case where the thief is identified after the fact. Subject to a civil action for twice the value of the thing stolen.
Furtum conceptum. Theft established by formal search: where, upon searching a person in the presence of witnesses according to prescribed procedure, the stolen item is found on that person. Distinct from manifest theft, conceptum gave rise to its own form of action.
Furtum oblatum. The situation where a stolen item is passed off onto an innocent third party, who is then found in possession of it on formal search. The oblatum action lay against the person who planted the goods, not against the innocent possessor.
Furtum usus. Theft of use — the unauthorized use of another's property by a person already in lawful possession (such as a borrower who uses the item beyond the permitted purpose). This subtype had no clean equivalent in common-law larceny.
Furtum possessionis. A species of theft committed by an owner against his own property — as where an owner retrieves property from a creditor holding it as a pledge, depriving the creditor of rightful possession.
Why It Matters in Research
Furtum is a gateway term for understanding how Roman law concepts were absorbed — selectively and imperfectly — into medieval English common law. Bracton's treatment of theft draws heavily on Justinianic sources, adapting the Roman definition while conforming it to common-law procedure. Researchers working in Bracton, Fleta, or the early Year Books will encounter furtum and its subtypes as live operative concepts, not mere antiquarian references.
The principal trap: the subtypes. Modern legal history sources sometimes discuss furtum without distinguishing furtum usus and furtum possessionis from ordinary theft. These subtypes matter enormously for understanding the Roman law of bailment, pledge, and loan — areas where the Roman framework diverges sharply from common-law doctrine. A borrower who misused a thing could be a thief under Roman law; under early common law, that same conduct would not constitute larceny.
For corpus researchers, furtum appears in: Latin-language common-law treatises (Bracton, Fleta); ecclesiastical and canon law materials addressing conscience and restitution; comparative law treatises of the seventeenth and eighteenth centuries; and Roman law scholarship absorbed into Scots law, which retained a civilian tradition more hospitable to Roman theft categories than English common law did.
The term virtually disappears from English legal usage after the seventeenth century. Its presence in a source is itself a dating and genre signal: a document using furtum as an operative term is almost certainly drawing on civilian or canonist learning rather than pure common-law authority.
Historical Dictionary Support
The three shelf sources agree on the core definition and share its Roman-law foundation. All trace furtum to Justinian's Institutes (4.1.1) and Digest (47.2.1.3), and all emphasize the fraudulent-handling formula rather than a simple taking-and-carrying requirement.
Burrill provides the most complete treatment, quoting the classical definition in Latin and noting that Bracton borrowed its terminology while modifying the framework to fit English conditions — a point of real research value since it signals where Bracton departs from his Roman sources rather than simply translating them.
Black's second edition adds the subtypes (furtum conceptum, oblatum) with brief definitions, and notes the separate meaning of furtum as the stolen thing itself (the res furtiva), not merely the act of stealing — a distinction relevant in Roman-law actions for recovery of property.
What the historical dictionaries underplay: the significance of furtum usus and furtum possessionis as analytically distinct categories, and the implications for bailment law. They also do not address the reception question — how completely, or incompletely, English common law absorbed the Roman categories — which is the question most likely to drive a legal historian's research.
Jurisdictional Note
Furtum as a live operative concept survives longest in Scots law and other mixed legal systems retaining a civilian foundation. In England, the term retreated to historical and comparative usage as common-law larceny doctrine developed its own internal vocabulary. Researchers working in colonial American legal materials will encounter furtum only in sources with explicit civilian influence; it does not appear as a term of art in ordinary colonial theft prosecutions.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Theft (for development of theft doctrine from Roman law through common law); Roman Law (for the institutional framework of the Institutes and Digest); Reception of Roman Law in England (for Bracton's adaptation of civilian sources).