Definition
Latin: "To render to each his own." One of the three foundational maxims of Roman law as formulated by Justinian in the Institutes, expressing the core principle that justice consists in giving every person what is rightfully theirs. The maxim functions less as an operative legal rule and more as a jurisprudential touchstone — a statement of what law, at its highest aspiration, is meant to accomplish.
The three Justinianic maxims together form the classical Roman definition of jurisprudence: honeste vivere (to live honorably), alterum non laedere (to harm no one), and suum cuique tribuere (to render to each his own). Of the three, suum cuique tribuere is the most philosophically ambitious and the most contested, because it presupposes that persons have rights or entitlements that can be identified and allocated — a claim that has occupied legal and moral philosophers ever since.
Common Language
The phrase has no significant modern common usage in English. It appears occasionally in philosophical and political discourse as a shorthand for distributive justice or fairness, but it carries no independent legal meaning outside its role as a foundational maxim. Webster's 1913 does not carry an entry. The gap between its philosophical resonance and its practical legal application is itself a defining feature of the term: it is invoked as a principle, rarely as a rule.
Common Confusion
Suum cuique tribuere is sometimes conflated with the broader concept of natural justice or equity as if it generates enforceable legal standards on its own. It does not. The maxim is a statement of jurisprudential purpose, not a cause of action, a defense, or a test. Researchers who encounter it in legal arguments should treat it as rhetorical and philosophical scaffolding rather than authority for a specific legal outcome. Separately, suum cuique tribuere is occasionally confused with distributive justice in the Aristotelian sense, though the two concepts overlap without being identical: Aristotle's distributive justice concerns proportionate allocation according to merit, while the Roman maxim is more abstract — concerned with rightful entitlement without specifying the metric of allocation.
Why It Matters in Research
Researchers encounter this maxim primarily in three contexts: (1) foundational jurisprudence and natural law scholarship, where it is cited to situate Western legal thought within a Roman framework; (2) historical commentary on the civil law tradition, particularly in treatises drawing on Justinian's Institutes and Digest; and (3) rhetorical passages in legal argument and judicial opinions where a writer invokes classical authority to frame a principle of fairness or rights allocation.
The practical research trap is weight. Because the maxim carries philosophical prestige, it can appear in legal arguments dressed as binding authority when it functions only as rhetorical support. Researchers should note whether a source is using suum cuique tribuere as a statement of principle or as the foundation for an actual legal rule — the distinction matters significantly for how much weight to assign the passage.
The maxim also serves as a useful index term when tracing the natural law tradition through common law sources. Blackstone, and commentators in his wake, drew on the Justinianic triad to connect English law to the Roman and canonical heritage. Encountering the phrase in a historical treatise is often a signal that the author is situating their argument within that inheritance, which carries implications for how they approach questions of rights, property, and justice more broadly.
Historical Dictionary Support
Black's Law Dictionary carries a terse but accurate entry: "To render to every one his own. One of the three fundamental maxims of the law laid down by Justinian." This is faithful to the source. Justinian's Institutes (Book I, Title I) articulates iuris praecepta sunt haec: honeste vivere, alterum non laedere, suum cuique tribuere — the precepts of law are these: to live honorably, to injure no one, to give every man his due.
Black's entry immediately follows with SUUS HÆRES, the civil law term for descendants under the power of the deceased, which is unrelated to suum cuique tribuere but shares a page by alphabetical proximity. Researchers working from older Black's editions should not treat the adjacency as a meaningful connection.
What historical dictionaries miss is the contested philosophical depth of the maxim. The question of what constitutes "one's own" — and who determines it — is precisely the question that divides natural law theorists from legal positivists, and Kantian rights theorists from utilitarian ones. Black's treats the phrase as settled and descriptive; in fact, it has been the subject of serious philosophical dispute from Cicero through Kant and into modern jurisprudence. Researchers working in legal philosophy will need to go well beyond dictionary sources.
Jurisdictional Note
Suum cuique tribuere has no jurisdiction-specific legal force in any common law system. It appears with greater frequency in civil law jurisdictions where the Roman law heritage is more directly acknowledged in legal education and judicial reasoning, but even there it functions as a maxim of principle rather than a rule of decision.