Definition
Aquilia refers primarily to the Lex Aquilia, a Roman statute (traditionally dated to around 286 BCE) that established liability for wrongful damage to another's property. The law created what modern lawyers would recognize as a tort action for negligently or intentionally causing physical harm to another person's slaves or animals, and for destroying or damaging other movable property. In Roman legal tradition, the Lex Aquilia is the foundational source of the law of delict — the Roman precursor to modern tort law — and its principles were elaborated extensively by the classical jurists, including Gaius, Ulpian, and Paul.
The term "Aquilia" standing alone typically functions as shorthand for this statute and the body of doctrine surrounding it. In legal historical writing, "Aquilian liability" or "Aquilian action" describes claims arising under the statute's framework, particularly the requirement that harm be caused corpore corpori — by one body to another body — and the defendant's culpa (fault), whether intentional or negligent.
Note: The Bouvier's entry reproduced under this heading ("ARALIA") appears to be a transcription or indexing error in the source material — the content describes arable land terminology entirely unrelated to Aquilia. Researchers should treat the Bouvier's entry as misattributed and consult the historical sources below independently.
Common Confusion
AQUILIA is sometimes loosely treated as synonymous with Roman delictual liability generally, but strictly speaking the Lex Aquilia addressed only a subset of delicts — chiefly damnum injuria datum (wrongful damage to property). Other Roman delicts, such as furtum (theft) and injuria (personal insult or affront), had separate legal frameworks. Conflating Aquilian liability with the whole of Roman tort law obscures important distinctions when tracing the development of negligence doctrine in civil law systems.
Why It Matters in Research
Aquilia is a foundational term for anyone researching the historical roots of tort law, negligence doctrine, or civil law systems. Several research traps are worth flagging:
First, the Bouvier's source entry is demonstrably mislabeled. The text reproduced under "ARALIA" concerns arable land (arare, to plough) and has no connection to Aquilian liability. Researchers relying on Bouvier's for this entry will find nothing useful and should treat it as a cataloguing error, not evidence that Bouvier's covered the term substantively.
Second, jurisdictional divergence is sharp. Aquilian principles passed into the Corpus Juris Civilis and from there into the civil law traditions of continental Europe, Scotland, Louisiana, Quebec, and South Africa — systems that still employ the vocabulary of delict and culpa. Common law jurisdictions absorbed some functional equivalents (negligence, trespass to chattels) but shed the Roman framework entirely. A researcher tracing negligence doctrine through common law sources will not encounter "Aquilian" as operative terminology; a researcher in Scots law or South African law will encounter it routinely.
Third, the term marks a major doctrinal crossroads in comparative legal history. The debate over whether Aquilian liability required intent (dolus) or mere carelessness (culpa) was unresolved in classical Roman law and became a site of significant juristic elaboration in the Digest. Later civilian jurists, particularly in the ius commune tradition, used that ambiguity to construct general theories of fault-based liability. Researchers tracing the intellectual genealogy of modern negligence must engage with this debate.
Fourth, corpus connections: Aquilia links directly to Roman law sources in the Digest (particularly D.9.2), to the natural law theorists (Grotius, Pufendorf) who reformulated Aquilian principles for early modern use, and to comparative tort scholarship generally. In a Law Mind corpus, documents on Roman law, civil law systems, comparative law, and the history of negligence will be the richest nodes.
Historical Dictionary Support
Bouvier's Law Dictionary, as noted, provides no usable entry for Aquilia — the reproduced text concerns arable land terminology entirely. This is a known hazard of historical legal dictionaries: indexing and transcription errors occasionally place unrelated content under a headword. Researchers should not infer from the Bouvier's entry that 19th-century American legal practice had no concept of Aquilian liability; rather, American common law had simply absorbed and transformed the underlying principles without retaining the Roman terminology.
Classical and civil law dictionaries — including the works of Adams (Roman Antiquities) and Berger (Encyclopedic Dictionary of Roman Law) — treat Aquilia substantively and are the appropriate shelf sources for this term. Berger's entry, in particular, distinguishes the three chapters of the statute and their differential application to killing of slaves and animals versus damage to other property.
Jurisdictional Note
Aquilian doctrine remains live terminology in civil law jurisdictions, particularly South Africa, Scotland, and Louisiana, where courts and scholars still invoke "Aquilian liability" as a recognized category. In common law jurisdictions, the term is historical and comparative only, encountered in academic scholarship rather than operative legal argument.