Definition
In legal usage, "prince" carries three overlapping meanings that have historically coexisted:
1. Sovereign ruler. A prince in the broadest legal sense is the supreme ruler of a nation or state — a sovereign who holds independent governing authority. This usage, common in international law and political theory, treats "prince" as synonymous with sovereign, monarch, or head of state regardless of the formal title that ruler holds.
2. Member of royal lineage. More narrowly, a prince is the son of a king or emperor, or any issue of a royal family — those of royal blood who bear the title by birth or grant. This is the sense invoked by the phrase "princes of the blood."
3. Chief or leader of a body. In an older and less common legal usage, "prince" could denote the chief or head of any organized body of persons, drawing on its root meaning of preeminent authority.
In English constitutional law, the most legally precise usage concerns the Prince of Wales — a title specifically designating the eldest son of the English sovereign and the heir apparent to the crown, created by letters patent or investiture.
Common Language
Modern common usage (Wiktionary): The title of a prince.
Historical common usage (Webster's 1913): The one of highest rank; one holding the highest place and authority; a sovereign; a monarch — originally applied to either sex, but now rarely applied to a female. Also, the son of a king or emperor, or the issue of a royal family.
Editorial note: The gap between common and legal meaning is modest but worth flagging. In contemporary ordinary English, "prince" almost exclusively denotes a male member of a royal family below the rank of king. In historical legal usage, the term carried far broader sovereign weight — a prince could be the supreme ruler of an independent state, not merely a secondary figure within a monarchy. Researchers working in early modern international law or political treatises will encounter "prince" used where a modern reader would expect "sovereign" or "head of state."
Common Confusion
"Prince" as sovereign versus "prince" as royal heir is the primary source of confusion in historical legal texts. A prince in Machiavellian and early modern political theory is an independent ruler; a prince in English constitutional law is characteristically subordinate to the reigning monarch. Context — particularly whether the source is treating of international relations, succession law, or domestic constitutional matters — determines which meaning applies. Researchers should also note that historical legal dictionaries, including Bouvier and both editions of Black's consulted here, present both meanings without clearly distinguishing when each applies, leaving that disambiguation to context.
Why It Matters in Research
The dual meaning of "prince" as both sovereign and royal subordinate creates real interpretive risk in historical legal sources. A text in international law from the seventeenth or eighteenth century using "prince" almost certainly means an independent sovereign — the Law of Nations literature (Vattel, Grotius, Pufendorf) consistently uses "prince" to mean the head of a state. The same word in English domestic law or succession materials refers to a member of the royal family, almost never the monarch herself.
Researchers working in the Law Mind corpus on topics touching sovereignty, diplomatic law, or the law of nations should treat "prince" as a near-synonym for "sovereign" in those materials and cross-reference accordingly. Conversely, in materials dealing with English succession, prerogative, or constitutional arrangements, the heir-apparent meaning dominates.
The Prince of Wales entry in Black's 2nd edition is the most legally operational definition in the historical dictionaries — it is the only sub-entry that attaches specific legal consequences (heir apparent status) to the title. Researchers interested in English succession law should note that the creation of the Prince of Wales title involves formal legal process (letters patent, investiture), distinguishing it from titles of the blood that descend automatically.
"Princes of the blood" as a phrase also has independent legal significance in monarchical systems — it defined a class of persons subject to specific rules on marriage, succession eligibility, and political incapacity. Researchers in French legal history in particular will find this phrase carrying substantial legal content beyond mere family description.
Historical Dictionary Support
All three source dictionaries — Black's 1st, Black's 2nd, and Bouvier's — give substantially identical definitions, presenting "prince" in three parallel senses (sovereign, royal issue, chief of any body) without significant divergence. This alignment suggests the compilers were drawing from a common source; Black's explicitly attributes the "chief of any body of men" formulation to Webster. The cross-dependence limits the independent analytical value of triangulating across these three sources.
What the historical dictionaries collectively omit is any treatment of "prince" in the international law tradition, where the term does the heaviest doctrinal work. They also do not address the legal mechanics of title creation (letters patent, investiture) or the specific legal incidents — rights, disabilities, obligations — attaching to persons of princely rank. Bouvier's in particular provides nothing beyond the definitional statement. Researchers seeking the legal content of royal titles will find the dictionaries a thin starting point and should move quickly to treatises on constitutional law and succession.
Black's 2nd edition adds the Prince of Wales sub-entry, the only substantive legal addition across the editions reviewed. The identification of the Prince of Wales as "heir-apparent" is the single instance where the historical dictionaries attach a concrete legal consequence to the term.
Jurisdictional Note
"Prince" as a legal term with operative consequences is primarily relevant in jurisdictions with monarchical constitutional structures. In common law systems derived from English law, its most frequent legal appearance is in succession and prerogative contexts. In American law, the term has no constitutional or statutory significance and appears mainly in historical materials, treaty interpretation, or the law of nations context.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Sovereignty; Succession to the Throne; Law of Nations.