Definition
Placita juris (Latin: "pleas" or "determinations of law") is a term used in classical English legal scholarship to denote a class of legal rules that are positive and particular in character — rules received and established by the law itself, not derived through logical inference or legal reasoning. The term is most closely associated with Francis Bacon, who distinguished placita juris from maxims (regulae juris) on the basis that maxims are conclusions drawn by reason from the nature of law, while placita juris are simply "laid down" — accepted as authoritative without requiring or offering a rational derivation.
Bacon described them as "particular and positive learnings of laws" and "grounds and positive learnings received with the law and set down." The implication is that these rules bind not because reason compels them, but because the law has adopted them as fixed positions. They are, in effect, legal posits rather than legal deductions.
The associated maxim — Receditur a placitis juris, potius quam injuriae et delicta maneant impunita ("Departure is made from the placita of law rather than that injuries and wrongs should remain unpunished") — reveals the practical significance of the category: even fixed positive rules of law can yield when strict adherence would produce injustice or allow a wrong to go without remedy.
Common Confusion
PLACITA JURIS vs. MAXIMS OF LAW: Researchers encountering both terms in the same source may treat them as synonyms. They are not. Maxims (regulae juris or brocarda) are generalized conclusions of legal reason, claims about what law must be because of its own logic. Placita juris are arbitrary positive rules — "arbitrary" in the classical sense of being determined by authority rather than derived by reason. The distinction matters to Bacon's taxonomy and reappears in any analysis of how pre-modern jurists classified legal rules. Conflating the two collapses a distinction Bacon thought essential.
Why It Matters in Research
This is a term of art belonging almost entirely to the English common law scholastic tradition, and it surfaces almost exclusively in Bacon's jurisprudential writings and the commentators who engaged with them. Researchers are unlikely to encounter it in modern case law or statutory materials. Its appearances in primary sources are concentrated in:
— Bacon's Maxims of the Law (Maxims), particularly the preface and Rule 12, which is the origin text for both Black's and Burrill's definitions.
— Secondary and historical commentaries on Bacon's jurisprudential method.
— Early common law treatises that adopted Baconian classification schemes.
The key navigational trap is the word "placita" itself. In other legal contexts — particularly in medieval and early modern procedure — "placita" simply means "pleas" in the procedural sense (as in placita corone, the pleas of the Crown, or placita communia, common pleas). A researcher scanning historical sources must determine from context whether "placita" is being used in the procedural-pleading sense or in Bacon's jurisprudential sense. The compound "placita juris" with the genitive "juris" is the reliable indicator of the Baconian usage.
Because neither Black's nor Burrill's provides more than a brief gloss, researchers who need to work with this concept substantively will need to go directly to Bacon's Maxims — the definitions in the historical dictionaries are essentially paraphrases of Bacon's preface and add little analytical depth beyond it.
No meaningful jurisdictional variation applies; this is a theoretical classification term, not an operative legal standard.
Historical Dictionary Support
Black's and Burrill's are in substantial agreement. Both trace the term directly to Bacon, both reproduce the characterization of placita juris as "particular and positive learnings" as opposed to maxims or conclusions of reason, and both cite the same sources (Bacon's Maxims, preface and Rule 12).
Burrill provides the more useful entry by including the opening words of the associated Latin maxim — Receditur a placitis juris, potius — which gives the reader the functional rule that Bacon himself derived from the category. Black's omits this connection in the main entry, though it separately defines the full maxim in its own right (Lofft, 415 being cited for the subsidiary rule on negative pleas, which is a separate matter entirely).
Neither dictionary contextualizes Bacon's distinction within the broader history of jurisprudence, nor do they flag the potential for confusion with the procedural uses of "placita." Researchers should treat both entries as pointers to Bacon rather than as independent analytical sources.
Encyclopedia Cross-Reference
No Law Mind Encyclopedia entry directly addresses Bacon's jurisprudential taxonomy or the classification of legal rules as placita juris. The Criminal Law Encyclopedia entries on grand jury proceedings and mistrial are not relevant to this term.