Definition
That branch of English common law governing the special legal position, powers, and privileges of the Crown. Prerogative law defined what the sovereign could do by right, without parliamentary authority — encompassing matters of royal character, royal authority, and royal income — and distinguished those powers from rights exercisable by ordinary subjects.
Prerogative law was not a self-contained code but a diffuse body of doctrine woven through common law, equity, and constitutional practice. It answered questions such as: What immunities does the Crown enjoy from suit? What revenues does the king take by right? What judicial and executive powers inhere in the office of the sovereign independent of statute?
Common Confusion
PREROGATIVE LAW vs. PREROGATIVE WRITS: The two are related but distinct. Prerogative law is the substantive body of doctrine defining royal powers and privileges. Prerogative writs (mandamus, certiorari, prohibition, habeas corpus, quo warranto) are procedural instruments — remedies of an extraordinary kind issued by courts in certain cases, never as a matter of right — through which courts superintended inferior tribunals and public officers. The writs derive from prerogative law but are not synonymous with it. Rapalje & Lawrence's entry trails off mid-sentence on this point, which itself signals how often the two concepts bleed together in older sources.
PREROGATIVE LAW vs. CONSTITUTIONAL LAW: In modern British constitutional usage, royal prerogative survives as a category of executive power, but it is now analyzed within constitutional law rather than as a separate body called "prerogative law." American researchers should not assume the term maps onto any U.S. constitutional doctrine.
Recognized Forms
/SUBTYPES
Rapalje & Lawrence organizes the direct prerogatives into three categories, which reflects the traditional common law division:
1. Prerogatives as to royal character — dignities, immunities, and the principle that the king can do no wrong.
2. Prerogatives as to royal authority — powers of governance, war and peace, appointment, and judicial supremacy.
3. Prerogatives as to royal income — the king's right to certain revenues, forfeitures, and incidents of tenure (including escheat, treasure trove, and royal fish).
Why It Matters in Research
Prerogative law is primarily a historical and comparative research category. It appears in Law Mind corpus materials as background doctrine in at least three research contexts:
First, in early American constitutional debates. The founding generation frequently invoked English prerogative doctrine — sometimes to adopt it, sometimes to repudiate it. Understanding what "prerogative" meant in Blackstone and in Coke is essential to reading those debates accurately. Arguments about executive power, pardon, and foreign affairs in the early Republic are incomprehensible without this background.
Second, in equity and administrative law history. Prerogative writ practice is the direct ancestor of modern judicial review of administrative action. Cases involving mandamus, certiorari, and prohibition draw on prerogative law even when that label is not used.
Third, in property law. Several common law property doctrines — escheat, bona vacantia, the law of treasure trove — are prerogative-law survivals. American states inherited some of these doctrines, modified others, and abolished still others. Their historical sources will invoke prerogative law directly.
A key research trap: sources from different periods use "prerogative" in different registers. In Tudor and early Stuart materials, prerogative was hotly contested constitutional ground. In Blackstone, it is organized and somewhat domesticated. In Victorian-era materials, much of what was prerogative law had been superseded by statute. In modern British usage, the term "royal prerogative" refers to a narrower surviving category of executive power. A researcher who does not date the source carefully will import the wrong assumptions.
Historical Dictionary Support
Black's and Rapalje & Lawrence are in complete agreement on the core definition, both citing Comyns' Digest (tit. "Ley," A or "Lev.," A) — a reference to Sir John Comyns' Digest of the Laws of England, a standard eighteenth-century English legal digest. The identical sourcing suggests both dictionaries are drawing from the same tradition rather than from independent analysis.
The historical dictionaries are thin on substance. Neither develops the actual content of prerogative doctrine; both treat the category as self-evident to their readers. This reflects the assumption — reasonable for a nineteenth-century practitioner audience — that Blackstone's Commentaries (particularly Book I, Chapters 7–9) provided the authoritative elaboration. Researchers who encounter these dictionary entries in isolation will find them unhelpfully spare. The real analytical content of prerogative law lives in Blackstone, Coke's Institutes, and Comyns' Digest itself, not in these brief glosses.
Rapalje & Lawrence's entry is notably incomplete; the text cuts off mid-sentence during the transition to prerogative writs. This is a corpus artifact to be aware of — do not treat the truncated entry as an exhaustive treatment.
Jurisdictional Note
Prerogative law as a named body of doctrine is specific to English common law and jurisdictions that received it directly. The United States did not receive royal prerogative as operative law, though many underlying doctrines were absorbed into state common law in modified form. Researchers working in Canadian, Australian, or other Commonwealth legal materials will find prerogative doctrine more directly operative and more continuously developed than in American sources.
Encyclopedia Cross-Reference
Law Mind Encyclopedia — Royal Prerogative
Law Mind Encyclopedia — Prerogative Writs
Law Mind Encyclopedia — Common Law Reception in American Jurisdictions