Definition
Bona mobilia (Latin: "movable goods") is a civil law term designating personal or movable property — things that can move themselves or be transported from place to place, and that are not permanently affixed to land, a farm, or a building. The term functions as the counterpart to bona immobilia (immovable property) and maps broadly onto what common law systems call personal property or personal chattels.
The distinction is foundational in civil law property systems: bona mobilia includes goods, livestock, furniture, tools, and similar objects capable of physical relocation, while the immobilia category captures land and fixtures. The line between the two categories carries legal consequences for succession, creditor rights, and conflict-of-laws rules governing which jurisdiction's law governs a property dispute.
Common Confusion
Bona mobilia is sometimes loosely equated with the common law concept of personal property, and the overlap is substantial but not perfect. Civil law systems built around the mobilia/immobilia divide do not map cleanly onto the common law distinction between real and personal property. In particular, common law treats certain fixtures and emblements in ways that have no direct civilian analog. Researchers working across both traditions should treat the terms as functional equivalents for most purposes while remaining alert to doctrinal gaps at the margins. Separately, bona mobilia should not be confused with bona fide, bona vacantia, or other Latin property phrases beginning with bona — each carries an independent and unrelated meaning.
Why It Matters in Research
This term appears primarily in historical legal sources and in materials touching civil law jurisdictions or mixed legal systems (Louisiana, Quebec, Scotland, South Africa). Researchers will encounter bona mobilia most often in three contexts: (1) historical property treatises and digests drawing on Roman law and its Continental successors; (2) conflict-of-laws discussions about which jurisdiction's rules govern movable versus immovable property in succession and contract disputes; and (3) early American legal materials, particularly from Louisiana, where civilian terminology persisted alongside common law influence.
A key navigational point: when reading older English-language legal dictionaries or treatises, bona mobilia often appears as part of a paired vocabulary with bona immobilia. Understanding the pair is essential — neither term is fully intelligible without the other. Researchers should also be aware that the mobilia/immobilia distinction drove important rules in private international law (choice of law): the traditional rule was that succession to movables followed the law of the decedent's domicile, while succession to immovables followed the lex situs. This choice-of-law significance is often the real reason the term appears in a given historical document.
Because the term is Latin and civilian in origin, it will not appear in most common law statutory codes or modern American case reporters except in specialized civil law contexts. Searches in general corpus tools should be supplemented with targeted searches in civilian legal materials, Roman law digests, and conflict-of-laws literature.
Historical Dictionary Support
The four source dictionaries are in close agreement on core meaning: bona mobilia denotes movable goods or personal chattels, distinguished from bona immobilia. Black's and Bouvier's add the useful gloss that these are things "not intended to make a permanent part of a farm, heritage, or building," grounding the definition in the practical test of permanent attachment rather than mere physical capacity for movement. This is an important nuance — an object that could theoretically be moved but is permanently integrated into a structure may not qualify as bona mobilia.
Burrill's entry is the most scholastically grounded, citing to the Digest of Justinian (Dig. 19.2.21; 19.1.50; 50.8.2) and to 1 P. Wms. 249-284 (Peere Williams's Chancery Reports), indicating the term's migration from Roman law sources into English equity practice. This cross-reference is valuable for researchers tracing how civilian concepts were absorbed into early English and American courts of equity.
Rapalje & Lawrence's entry adds the explicit contrast with bona immobilia, which the other dictionaries imply but do not always state directly. The fragment about a "separate instrument" in that entry appears to be a printing artifact from an adjacent entry and should be disregarded.
None of the historical dictionaries address the conflict-of-laws significance of the movable/immovable distinction, which became one of the term's most practically important dimensions in nineteenth-century private international law. Researchers relying solely on dictionary definitions will miss this dimension and should consult treatises on private international law and choice of law for the fuller picture.
Jurisdictional Note
The mobilia/immobilia distinction retains operative legal significance in mixed civil law jurisdictions including Louisiana and Quebec, as well as in private international law contexts where courts must classify property as movable or immovable to determine which jurisdiction's law applies. In purely common law jurisdictions, the term itself has no statutory standing, but its functional analog — the real/personal property distinction — serves similar purposes.