Definition
Forum regium (Latin: "the king's court") is a historical term for the royal court — the central judicial tribunal acting under the authority of the crown. In medieval English legal practice, it referred to the court of the sovereign as the supreme seat of justice, distinct from local, ecclesiastical, or feudal courts that operated alongside or beneath it. The term appears most directly in connection with the Statute of Westminster II (1285), chapter 43, which addressed jurisdictional matters of the royal courts.
The term belongs to a family of forum-based Latin phrases used in classical and medieval legal writing to identify which court had proper authority over a given matter. Within that family, forum regium is specifically the king's court — jurisdiction grounded in royal prerogative rather than local custom, baronial privilege, or church authority.
Common Confusion
Forum regium should not be confused with related forum terms that appear in the same historical sources:
FORUM REI (or FORUM REI SITAE) refers to the court of the place where the subject matter — typically land or property — is located. It answers the question of where a thing is situated, not whose court is sovereign. Burrill draws the distinction clearly: forum rei is the tribunal determined by the location of the disputed property, while forum regium is determined by the authority of the crown.
FORUM REI GESTAE refers to the court of the place where a transaction or act occurred — the venue determined by where events took place rather than where property sits or where the king's authority is exercised.
Researchers working through historical conflict-of-laws materials will encounter all three in close proximity. Confusing them produces errors in reconstructing which court a historical source treats as having proper jurisdiction.
Why It Matters in Research
Forum regium is primarily a term of historical and comparative legal interest rather than one with active modern application. Researchers encounter it most often in:
Medieval and early modern English legal history. The term appears in discussions of the growth of royal jurisdiction — the crown's courts expanding at the expense of feudal and ecclesiastical tribunals. Understanding forum regium in this context means understanding the jurisdictional competition that shaped the common law's institutional development.
Historical conflict-of-laws scholarship. Burrill pairs forum regium with forum rei and forum rei gestae, making clear that classical and medieval jurists developed a vocabulary for distinguishing the bases of judicial authority. Story's Conflict of Laws and Kent's Commentaries (both cited by Burrill) use this Latin vocabulary when analyzing which court's law governs a dispute. Researchers working in pre-twentieth-century conflict-of-laws materials must be comfortable with the full family of forum terms to read those sources accurately.
Statutory interpretation of early English statutes. The reference in both Black's and Burrill to Statute of Westminster II, c. 43 is an anchor point. Researchers tracing the development of English civil procedure or the reach of crown authority in the thirteenth century will find forum regium appearing in commentaries on that statute.
The term does not carry forward into modern Anglo-American jurisdictional doctrine in its Latin form. Modern equivalents — questions of federal versus state court authority, the reach of a sovereign's courts — are handled through entirely different doctrinal vocabulary. Do not search modern case law for forum regium expecting substantive results; the term is essentially confined to historical and comparative sources.
Historical Dictionary Support
Black's Law Dictionary renders forum regium briefly and accurately: "The king's court. St. Westm. 2, c. 43." It offers nothing beyond the translation and statutory citation, treating this as a minor historical term requiring only identification.
Burrill's Law Dictionary is more useful. It situates forum regium within the broader taxonomy of forum-based Latin terms and points directly to Story's Conflict of Laws and Kent's Commentaries as the sources where these distinctions matter analytically. Burrill's entry signals that forum regium was not merely decorative Latin but part of a working vocabulary for identifying which sovereign's tribunal held authority — a question that remained live in conflicts analysis well into the nineteenth century.
Neither dictionary traces the Roman law origins of forum vocabulary or explains the institutional history that made the phrase meaningful. For that context, researchers must look beyond these sources to histories of English legal institutions and to scholarly commentary on the Statute of Westminster II.
Jurisdictional Note
Forum regium as a concept is specific to legal systems organized around royal or sovereign court authority. It has no direct counterpart in American federal constitutional structure, where judicial authority derives from constitutional grant rather than crown prerogative. The phrase appears in American legal literature almost exclusively in historical or comparative discussion.
Encyclopedia Cross-Reference
The Law Mind Contracts & Commercial Law Encyclopedia: International Contracts — Choice of Law and Choice of Forum Clauses (contracts_208) — For researchers connecting historical forum vocabulary to modern choice-of-forum analysis.
The Law Mind Employment & Labor Law Encyclopedia: Choice of Law and Forum Selection in Restrictive Covenant Disputes (employment_131) — Useful context for tracing how forum-selection doctrine evolved from its historical roots.