International Law & Diplomacy Codexery

Royal prerogative

Customary authority of the sovereign exercised on ministerial advice.

Royal prerogative

Martin Falbisoner · CC BY-SA 3.0

The royal prerogative refers to the set of traditional powers, privileges, and immunities that belong to a monarch under common law—and, in some cases, under civil law in monarchies—but are now largely exercised on the advice of ministers. It provides the basis for certain executive functions of the state that are formally held by the sovereign.

In most constitutional monarchies, parliament can abolish these prerogatives through legislation. For Commonwealth realms, this principle stems from constitutional laws enacted around the time of the Glorious Revolution, when William III and Mary II were invited to the throne. In the United Kingdom, the remaining prerogative powers are formally exercised by the monarch on the advice of ministers, not delegated to the Prime Minister personally, and associated benefits—such as treaty ratification and mineral rights to gold and silver ores—belong to the Crown as a property right, not the government.

Originally, British monarchs used prerogative powers without needing parliamentary consent, except in areas where Magna Carta had established parliamentary authority. Over the 18th and 19th centuries, the convention developed that these powers are exercised—apart from a few economically minor exceptions—on the advice of the Prime Minister or Cabinet, who are accountable to Parliament (and solely so, except in matters concerning the Royal Family), a practice established at least by the reign of William IV. In liberal democracies that are constitutional monarchies, like Denmark, Norway, and Sweden, the royal prerogative now functions mainly as a ceremonial part of state power.

Today, prerogative powers fall into two categories: those directly used by ministers without parliamentary approval—such as regulating the civil service, issuing passports, and granting honours in some countries like the UK—and those the monarch exercises nominally, “on the advice of” the Prime Minister and Cabinet, as required by constitutional convention. While some key government functions still rely on the royal prerogative, its use is declining as more powers are set out in statute.

In the Kingdom of England, the Kingdom of Great Britain, and the United Kingdom, the royal prerogative has long been a central feature of governance. Constitutional theorist A. V. Dicey defined it as the remaining portion of the Crown’s original authority—the residue

field
Constitutional law
known_for
Residual discretionary powers of the Crown exercised on ministerial advice
type
Customary authority
jurisdiction
Commonwealth realms and other constitutional monarchies

Lore & Background

In most constitutional monarchies, prerogatives can be abolished by Parliament under its legislative authority. In the Commonwealth realms, this draws on the constitutional statutes at the time of the Glorious Revolution, when William III and Mary II were invited to take the throne. In the United Kingdom, the remaining powers of the royal prerogative are formally exercised by the monarch on the advice of ministers, not delegated to the Prime Minister personally; the benefits, such as ratification of treaties and mineral rights in all gold and silver ores, vest in the Crown as a property right, not the government.

Reader's Guide

The royal prerogative is a central feature of governance in the United Kingdom and other Commonwealth realms, though its scope is difficult to determine due to the uncodified nature of the constitution. Constitutional theorist A. V. Dicey defines it as the residue of discretionary power left at any moment in the hands of the Crown. The existence and extent of the power is a matter of common law, making courts the final arbiter. Since the Case of Proclamations (1611) and the Glorious Revolution, the judiciary has asserted its right to determine the limits of the prerogative. Today, prerogative powers fall into two categories: those directly exercised by ministers without parliamentary approval (e.g., regulating the civil service, issuing passports, granting honours) and those exercised nominally by the monarch on the advice of the prime minister. Its usage is falling as functions are progressively made statutory. In British overseas territories, the Crown retains all state power in theory, though this was limited by Campbell v Hall (1774), which held that once a colony gained a representative assembly, the Crown could not raise taxation or change law without that assembly's consent.

Did You Know?

Defining the Crown's Residual Authority

The royal prerogative represents a collection of customary powers, privileges, and immunities that common law recognises as belonging to the sovereign. In some civil law jurisdictions that maintain a monarchy, similar concepts also appear. Over time, these powers have become broadly vested not in the monarch personally but in the government as a whole, serving as the mechanism through which certain executive functions of the state are carried out. The constitutional theorist A. V. Dicey captured its essence by describing it as the remaining portion of the Crown's original authority—the residue of discretionary power left at any given moment in the hands of the Crown, whether that power is in fact wielded by the monarch directly or delegated to ministers. This framing highlights that the prerogative is not a fixed, enumerated list of powers but rather whatever discretionary authority has not been absorbed into statute or otherwise constrained by the evolving constitutional order.

From Sovereign Will to Ministerial Routine

In the Kingdom of England, Great Britain, and later the United Kingdom, the royal prerogative has been a central pillar of governance throughout the realm's history. Originally, the monarch exercised these powers without any observed requirement for parliamentary consent, a practice that persisted even after Magna Carta empowered Parliament in certain matters. A decisive shift came with the Glorious Revolution of 1688, when William III and Mary II were invited to assume the throne under constitutional statutes that fundamentally altered the balance of authority. Following the accession of the House of Hanover, prerogative powers came to be exercised, with only minor exceptions in economically insignificant sectors, on the advice of the Prime Minister or the Cabinet. Since at least the reign of William IV, these ministers have been accountable exclusively to Parliament, except in matters concerning the Royal Family. In liberal constitutional monarchies such as Denmark, Norway, and Sweden, the prerogative has been reduced in practice to a prescribed ceremonial function of state power.

The Courts as Ultimate Arbiters

Because the British constitution is uncodified, determining the precise scope of the royal prerogative remains an inherently difficult task. The existence and extent of any particular prerogative power is a matter of English common law, which places the courts in the position of final arbiter over whether a given type of prerogative actually exists. This judicial role was emphatically asserted in the Case of Proclamations of 1611, during the reign of King James VI and I, when English common law judges declared their right to determine the boundaries of royal authority. Since the Glorious Revolution of 1688, the Crown has not challenged this interpretation of a separate and distinct judicial power. It has been accepted that it is emphatically the province of the courts to declare what the law is or means. This principle stands as a crucial foundation for the concept of judicial power and its distinct, separate nature from the executive power held by the Crown or its ministers. In most cases today, the Monarch exercises prerogative powers only on the advice of the Government of the day, either directly or through the Privy Council.

Ministerial Practice and Colonial Inheritance

In contemporary practice, prerogative powers fall into two broad categories. The first comprises those directly exercised by ministers without parliamentary approval, including, in the United Kingdom, the powers to regulate the civil service, issue passports, and grant honours. The second category is exercised nominally by the monarch on the advice of the Prime Minister and Cabinet, though in reality this reflects constitutional convention rather than genuine royal discretion. Notably, the usage of the prerogative is declining as governmental functions are progressively made statutory. In British overseas territories, the Crown theoretically retains all state power, making the prerogative an unlimited, arbitrary authority in principle. However, the 1774 case of Campbell v hall established that once a colony gained a representative assembly, the Crown could not raise taxation or change the law without that assembly's consent. In the Turks and Caicos Islands in 2009, the UK government took direct control under the West Indies Act 1962 rather than through the prerogative, vesting wide powers in the governor who acts on UK government instructions.

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Frequently Asked Questions

What is the Royal prerogative?

It is a body of traditional discretionary powers and privileges that historically attached to a monarch under common law. These powers supply the legal basis for certain executive functions of the state that are formally vested in the sovereign.

Who actually exercises Royal prerogative powers in modern states?

In contemporary constitutional monarchies, the Crown's prerogative is carried out on the advice of government ministers rather than at the sovereign's personal whim. The monarch therefore acts as the formal legal actor while elected officials make the substantive policy choices.

What type of legal authority is the Royal prerogative?

It is classified as a form of customary authority rooted in common-law tradition. It sits within the field of constitutional law and applies across Commonwealth realms as well as other constitutional monarchies.

Can Parliament abolish or limit the Royal prerogative?

Yes—legislatures in most constitutional monarchies retain the power to remove or narrow these prerogatives through ordinary statutes. This principle was cemented in the constitutional settlement following the Glorious Revolution, which clarified the balance between Crown authority and parliamentary sovereignty.

Why does the Royal prerogative matter for international law and diplomacy?

Many core diplomatic acts—such as concluding treaties, recognizing foreign states, and declaring war—are formally grounded in the sovereign's prerogative. Grasping this framework is essential for understanding how a Commonwealth or other constitutional monarchy legally authorizes its international commitments.

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