Wikipedia
Furtum was a delict of Roman law comparable to the modern offence of theft (as it is usually translated) despite being a civil and not criminal wrong. In the classical law and later, it denoted the contrectatio (“handling”) of most types of property with a particular sort of intention – fraud and in the later law, a view to gain. It is unclear whether a view to gain was always required or added later, and, if the latter, when. This meant that the owner did not consent, although Justinian broadened this in at least one case. The law of furtum protected a variety of property interests, but not land, things without an owner, or types of state or religious things. An owner could commit theft by taking his things back in certain circumstances, as could a borrower or similar user through misuse.
The Romans distinguished between "manifest" and "non-manifest theft" based on how close to the scene of the crime the thief was caught, although exactly where the line was debated by jurists. Under the Twelve Tables, death or flogging could be expected for a manifest thief, later changed to damages of four times the thing. The penalty for non-manifest theft was two times. There were complementary actions against the occupier of the property where the stolen goods were found, if the defendant did not bring the thing to court or refused a search. Vindicatio or condictio could also be undertaken by the owner of the thing, in addition to an action under furtum.