Definition
Of positive law. A Latin phrase used to characterize rules, regulations, or requirements that derive their authority from human enactment — statute, custom, or civil authority — rather than from natural law, divine law, or universal moral principles. A rule is described as *juris positivi* when its content is arbitrary in the sense that it could have been otherwise; the rule binds not because reason compels a particular result, but because law has fixed it. The classic examples are the age of majority set at twenty-one years and the rules governing succession to estates — neither follows necessarily from nature, but both bind by force of civil law's declaration.
The phrase stands in contrast to *juris naturalis* (of natural law) and *juris divini* (of divine law), which describe obligations regarded as binding by reason or divine command independent of any human legislation.
Common Confusion
JURIS POSITIVI is sometimes loosely conflated with *jus positivum* (positive law as a body or system). The distinction matters: *jus positivum* names the system itself, while *juris positivi* is a genitive modifier applied to a specific rule or requirement to characterize its source. Saying a rule is *juris positivi* is saying something about that rule's pedigree — it is a creature of enacted or declared law, not of universal principle.
Researchers should also take care not to confuse the adjective "positive" here with any modern sense of approval or benefit. In the legal tradition, "positive" derives from the Latin *positum* — something laid down or fixed — and carries no normative valence.
Why It Matters in Research
The phrase appears almost exclusively in treatise literature and older legal commentary, not in modern statutes or judicial opinions. Researchers encountering *juris positivi* will find it concentrated in Blackstone's *Commentaries* and the treatises that cite Blackstone, particularly in discussions of property law, the law of persons, and succession. Burrill's examples — the age of majority and rules of succession — reflect the standard 18th- and 19th-century use of the term to signal that a rule is contingent, reformable, and jurisdiction-specific rather than fixed by higher authority.
The phrase carries interpretive weight in those older sources: labeling a rule *juris positivi* was often a prelude to arguing that it could or should be changed, or that equity might relieve against its strictness in a particular case. A reader of Blackstone or Stephen's *Commentaries* who misses this signal may underestimate the implicit argument being made.
In American legal sources before the Civil War, the natural law / positive law distinction organized significant debates — over slavery, over the common law's adaptability, over constitutional interpretation. The phrase *juris positivi* appears in that context as a marker in those deeper arguments. Researchers working in antebellum legal literature should be alert to its rhetorical as well as descriptive function.
Modern sources rarely use the Latin. Contemporary equivalents include "creature of statute," "positive law rule," or simply a note that a rule is legislatively rather than constitutionally or naturally grounded.
Historical Dictionary Support
Black's and Burrill's agree precisely on the core definition, and both cite Blackstone (1 Bl. Comm. 439) and Stephen's *Commentaries* (2 Steph. Comm. 286) as the authoritative sources. Burrill adds the two concrete illustrations — the age of majority and succession rules — drawn from Blackstone, which are the clearest surviving examples of the term's practical deployment in English legal literature.
Neither dictionary addresses the phrase's rhetorical function, its use as an implicit argument for reform or equitable exception, or its role in American legal debate. Historical dictionaries treat it as definitional rather than argumentative, which understates how the term operated in actual legal writing.
The maxim appended in Black's — *Juris præcepta sunt hæc: Honeste vivere; alterum non lædere; suum cuique tribuere* ("the precepts of the law are these: to live honorably, to harm no one, to render to each his due," from Justinian's *Institutes* 1.1.3) — is included by Black's as an adjacent entry and is not a definition of *juris positivi* itself. Researchers should read it as contextual flavor, not as part of the phrase's meaning.
Encyclopedia Cross-Reference
No Law Mind Encyclopedia entry directly addresses the natural law / positive law distinction as a doctrinal matter. The Grand Jury and Mistrial entries identified as potential matches concern jury proceedings and do not engage this concept.