Definition
A Latin pronoun meaning "his," "her," "its," or "one's own." In legal usage, *suum* appears most commonly as part of the foundational maxim *suum cuique tribuere* — "to give to each his own" — which Roman jurists identified as one of the three basic precepts of law. The term functions less as a standalone legal term and more as a building block within Latin legal phrases that appear throughout civil law, common law treatises, and equity doctrine.
The related phrase *suum jus* ("one's own right") appears in discussions of the proper exercise of legal entitlements. The adage *suum cuique* operates as a shorthand principle of distributive justice: that legal systems exist, in part, to allocate to each person what is properly theirs. This principle appears in Justinian's *Institutes* and was carried into English legal literature through the influence of civilian scholars and natural law theorists.
The word also appears in the phrase *de suo* (out of one's own) and in contexts involving personal liability, ownership, and inheritance in civil law analysis.
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Why It Matters in Research
Researchers encountering *suum* in historical legal texts will almost never find it as a freestanding term with independent legal effect. Its importance is almost entirely contextual — it signals that the surrounding phrase is drawing on Roman or civil law principles, often to articulate a foundational norm of justice or entitlement.
The maxim *suum cuique tribuere* appears in natural law writing, equity treatises, and early Anglo-American jurisprudence as a rhetorical and philosophical anchor. When tracing the intellectual genealogy of doctrines involving property rights, distributive justice, or the law of persons, encountering *suum* in a source is a reliable indicator that the author is reaching toward Roman law for grounding.
Researchers should be alert to the reflexive quality of *suum* in Latin: unlike *ejus* (his, as a third-person non-reflexive), *suum* refers back to the subject of the clause. This grammatical distinction carries legal significance in civil law texts interpreting the *Digest*, where the question of whether property belongs to oneself (*suum*) or to another (*alienum*) determines applicable rules. Burrill's reference to the *Digest* (56.16.239.9) points directly to this construction question.
Do not conflate appearances of *suum* in maxims with substantive legal rules. The term marks a philosophical posture, not a cause of action or enforceable standard. In corpus research, searching for *suum* in isolation will surface Latin-heavy texts — treatises, civil law commentaries, and equity scholarship — rather than operative pleadings or statutes.
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Historical Dictionary Support
The historical dictionaries diverge in what they treat as the primary entry under this headword, and that divergence is itself informative.
Black's and Rapalje & Lawrence both define *suum* as "to offer duel or combat as a legal trial and appeal," referencing its abolition under 59 Geo. III, c. 46, and cross-referencing *Battel*. Black's adds a second sense: *to defendere unicâ manu*, meaning to wage law — a denial of an accusation upon oath, cross-referenced to Wager of Law.
Burrill, by contrast, goes to the Latin root directly: "His; his own," with a cross-reference to the civil law construction question in the *Digest*.
The conflict here is almost certainly a headword collision. Black's and Rapalje appear to have indexed entries for obsolete procedural terms — specifically *sue* or *suage* (the Middle English and Law French verb for making an appeal by combat or waging law) — under the Latinized spelling *suum*, while Burrill correctly identifies *suum* as the Latin possessive pronoun. Researchers should treat the Black's and Rapalje entries with caution: those definitions almost certainly describe a different term that was improperly filed under this headword, or represent an archaic anglicization of a Latin-origin procedural term that has since been reorganized in modern editions. The substantive content of those entries — trial by combat and wager of law — properly belongs under *Battel* and *Wager of Law* respectively.
Burrill's entry is the more reliable guide to the term as it appears in civil law sources.
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Roman Law Foundations; Maxims of Law; Wager of Law; Trial by Battle
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