Definition
Latin: "rights of things." In classical legal classification, jura rerum denotes the branch of private law concerned with rights that a person may acquire over external objects — property and things existing apart from the person who holds rights in them. The phrase stands in contrast to rights of persons (jura personarum), which concern the legal status, capacities, and relations of individuals themselves.
The concept originates in Roman law's tripartite division of private law into persons, things, and actions, and it was transmitted to English legal thought principally through Blackstone's Commentaries. Blackstone opens Book II — the volume devoted to property — with the observation that jura rerum encompasses all rights a person may acquire in things unconnected with his own person. The phrase thus functions less as an operative legal term and more as a taxonomic label for the whole of property law as a field of study.
Why It Matters in Research
Researchers encounter jura rerum most frequently in two contexts: (1) reading Blackstone and the tradition of English institutional writing that followed him, and (2) tracing Roman law classifications through later civilian and common law scholarship.
In Blackstone-era and nineteenth-century American legal writing, jura rerum served as a genuine organizing concept. Treatise writers and law lecturers used it to signal that they were entering the domain of property rather than personal status. When a historical source uses this phrase, it is almost certainly operating within a Blackstonian or civilian taxonomic framework, not describing a specific right or remedy.
Researchers should note that the phrase does not itself describe a right enforceable in any proceeding. It is a category, not a cause of action or a doctrine. Searching primary sources for jura rerum will return organizational and pedagogical uses, not litigation records. In the Law Mind corpus, the term appears in treatises, commentaries, and legal education materials rather than in pleadings or judicial opinions.
The associated maxim appearing in the source dictionaries — Jura sanguinis nullo jure civili dirimi possunt ("The rights of blood and kindred cannot be destroyed by any civil law") — appears under this heading in some editions as a related Latin maxim rather than a direct definition. Researchers using older editions of Black's should be alert to this layout: the maxim follows the definition but is a distinct rule of law, not an elaboration of jura rerum itself.
Historical Dictionary Support
The three source dictionaries are in close agreement. Black's, Rapalje & Lawrence, and Burrill all define jura rerum as the rights a person may acquire in things — external objects unconnected with his person — and all cite Blackstone's Commentaries (1 Bl. Comm. 122; 2 Bl. Comm. 1) as the primary reference point.
Burrill adds a citation to Hale's Analysis, reinforcing the institutional genealogy of the term. Rapalje & Lawrence is notable for including a second entry immediately following — jura summa imperii (the supreme rights of dominion) — situating jura rerum within a cluster of classificatory Latin phrases that structured nineteenth-century property discourse.
None of the source dictionaries treat jura rerum as a working legal concept with elements, tests, or applications. All three treat it as a term of taxonomy. This is historically consistent: the phrase did significant work in legal education and treatise organization, but it never developed independent doctrinal content in common law jurisdictions.
What the historical dictionaries do not address is the Roman law context from which the term came. In Justinian's Institutes, the division between persons, things, and actions (personae, res, actiones) was a foundational framework, and jura rerum carried more architectural weight in civilian systems than it ever did in English law. Researchers working on comparative or civil law topics should consult civilian sources directly rather than relying on the common law dictionary tradition.
Jurisdictional Note
Jura rerum has no operative jurisdiction-specific meaning in modern American, English, or Commonwealth law. Its significance is historical and taxonomic. Civil law jurisdictions that retain explicit Roman law classification structures may use cognate terminology more actively, but even there the phrase itself is primarily a term of legal history and education.