Prince's Case

The Prince's Case (1606) 8 Co Rep 1a arises in the early years of the reign of King James I, a period characterised by intensifying constitutional friction between the Crown and the common law courts. James I entertained an expansive view of royal prerogative, drawing upon Continental and Scottish doctrines of divine right monarchy to assert that the sovereign possessed inherent authority to govern by decree. It is against this political and constitutional backdrop that the questions resolved in this case must be understood.

King James I issued a series of royal proclamations that purported to regulate areas of trade and commerce, and which went further than mere enforcement of existing law. The proclamations in question sought to create new obligations binding upon the subject and, crucially, to attach criminal penalties to conduct that had not previously been made punishable by any Act of Parliament or established rule of the common law. The exercise of this power was not, in the Crown's submission, an innovation but rather an expression of the inherent executive authority residing in the royal prerogative.

The matter came before the courts when the validity and legal force of these proclamations were challenged. The challenge raised a fundamental constitutional question: whether the executive authority of the Crown, acting alone without recourse to Parliament, could alter the legal rights and obligations of subjects, and more specifically, whether it could create criminal liability where none previously existed under statute or common law.

Sir Edward Coke, who at this period was Chief Justice of the Common Pleas and one of the foremost legal minds of his generation, was central to the adjudication of this matter. Coke had already established himself as a formidable defender of the common law against both ecclesiastical and royal encroachment, and the Prince's Case afforded him a significant opportunity to articulate the constitutional limits of prerogative power in formal judicial terms.

The case is reported in Coke's own reports, which, while authoritative sources of Jacobean case law, reflect Coke's own constitutional perspective and must be read with the understanding that the reporter and the judicial protagonist are the same person. Notwithstanding this caveat, the legal principles stated in the report have exercised lasting influence over the development of English public law and are treated as authoritative statements of the constitutional position as it obtained in the early seventeenth century.

The central issue for determination was whether the Crown, acting through the executive instrument of a royal proclamation issued without parliamentary approval, possessed the legal power to create new criminal offences and thereby impose criminal liability upon subjects for conduct not previously prohibited by statute or common law. This question went to the heart of the constitutional relationship between the royal prerogative and the established law of the land.

A secondary but closely related issue concerned the permissible scope of royal proclamations more generally: even if the Crown could not create new offences, could it nonetheless use proclamations to expand, supplement, or modify existing legal obligations in ways that effectively altered the practical operation of the law without formal legislative action? The court's resolution of this subsidiary question was important in defining the residual legitimate uses of the prerogative power of proclamation.

The court began its analysis from first principles concerning the nature and source of legal obligation in English law. Coke reasoned that the criminal law of England derived its authority either from Acts of Parliament or from the common law as declared by the courts. Both sources of law were external to the unilateral will of the executive and were not subject to modification by executive decree alone. The subject's liberty could only be curtailed in accordance with law established through one of these recognised sources of legal authority.

Coke drew upon the foundational principle that the King, though sovereign, ruled within and not above the law. This maxim, tracing its roots to Bracton's famous aphorism that the King ought to be under God and the law, meant that even the highest executive authority in the realm was subject to legal constraint. The rule of law, as Coke conceived it, was not merely a political aspiration but a legally enforceable constitutional reality, and the common law courts were its guardians.

The court rejected the Crown's contention that the prerogative power of proclamation was an inherent attribute of sovereignty capable of generating new legal obligations without external authorisation. Coke distinguished between the exercise of prerogative powers within the law — which was constitutionally permissible — and the use of prerogative to alter or override the law — which was not. The prerogative, properly understood, operated within the legal order rather than standing above it.

A particularly significant element of the court's reasoning was its treatment of the relationship between liberty and criminal law. Coke held that no man could be made liable to criminal punishment except by authority of law recognised as such by the courts of common law. A royal proclamation, however solemnly issued and however widely promulgated, did not constitute law in this sense and could not of itself deprive a subject of liberty or property as a penalty for disobedience. To hold otherwise would be to subject the subject's liberty to the unfettered will of the Crown, a proposition fundamentally inconsistent with the English constitutional tradition.

The court also considered and rejected the argument that historical practice supported the Crown's claim. While it was acknowledged that monarchs had long issued proclamations, Coke reasoned that the mere antiquity of a practice did not confer legal validity upon it. Many historical proclamations had operated within existing legal frameworks or had been confirmed and given statutory force by Parliament. The existence of such proclamations did not establish a constitutional power to create new law by executive action alone.

Coke's reasoning engaged with the constitutional role of Parliament as the supreme legislative authority of the realm. The court held that fundamental legal changes — and the creation of criminal offences was treated as among the most fundamental of such changes — required the assent of the King-in-Parliament, that is, the Crown acting together with the Lords and Commons in their legislative capacity. The Crown acting alone through proclamation was constitutionally incapable of effecting such changes because it was acting in its executive rather than its legislative capacity.

The court did, however, take care to preserve a legitimate role for royal proclamations within the constitutional order. Coke acknowledged that proclamations retained a proper function in the enforcement and administration of existing law. Where Parliament had already legislated, or where the common law already imposed an obligation or prohibition, a royal proclamation could legitimately draw the attention of the subject to that pre-existing legal obligation, exhort compliance, or organise the machinery of enforcement. What the prerogative could not do was supply the legal obligation itself where none previously existed.

This distinction between proclamations that enforce existing law and proclamations that purport to create new law was central to the court's constitutional analysis. It enabled the court to articulate a principled boundary around the prerogative power of proclamation without abolishing that power altogether. The court was not holding that proclamations were constitutionally impermissible instruments; it was holding that their constitutional function was essentially executive and administrative rather than legislative.

The court's reasoning also reflects a broader concern about the constitutional dangers of allowing the executive to legislate unilaterally. If the Crown could create criminal offences by proclamation, the liberty of every subject would be contingent upon the will of the monarch, since new categories of criminal conduct could be created at any time without the check of parliamentary deliberation or common law development. The court's holding can therefore be understood not merely as a technical constitutional ruling but as a principled defence of the subject's liberty against arbitrary executive power.

In reaching its conclusion, the court implicitly affirmed the supremacy of statute and common law over executive action, articulating what later constitutional doctrine would recognise as the principle that the executive derives its authority from law and cannot act in derogation of it. This principle, while stated in the particular context of royal proclamations and criminal liability, has proven generative far beyond its immediate context, providing a conceptual foundation for subsequent limitations on executive power throughout English and British constitutional history.

The court held that the Crown does not possess the power to create new criminal offences or to alter the existing law of the land by royal proclamation issued without parliamentary consent. A royal proclamation purporting to impose criminal liability for conduct not already prohibited by statute or common law is beyond the constitutional competence of the Crown and does not have the force of law.

It was further held, by way of clarification of the permissible scope of the prerogative power of proclamation, that royal proclamations may lawfully be used to enforce existing legal obligations established by Parliament or the common law. The prerogative power of proclamation is thus a power exercisable within the law but not a power to make law, and its legitimate exercise is confined to the executive and administrative sphere.

The Prince's Case represents one of the earliest and most significant judicial articulations of the principle that executive power is subject to legal constraint and that fundamental legal changes require legislative rather than executive authority. In the longer arc of English constitutional history, the case stands as an important precursor to the constitutional settlement achieved through the Glorious Revolution of 1688 and the subsequent Bill of Rights 1689, which gave statutory expression to many of the limitations on royal power that Coke had sought to articulate through judicial reasoning in the early seventeenth century.

The principle established in the Prince's Case — that the Crown cannot legislate by proclamation — has been subsequently reaffirmed and developed in a number of important constitutional cases. Most notably, the principle resonates in the reasoning of the House of Lords in R v Secretary of State for the Home Department, ex parte Fire Brigades Union [1995] 2 AC 513, which affirmed that the executive cannot use prerogative powers to frustrate the will of Parliament as expressed in statute. More recently, the Supreme Court's decisions in R (Miller) v Secretary of State for Exiting the European Union [2017] UKSC 5 and R (Miller) v The Prime Minister [2019] UKSC 41 both draw upon the foundational proposition, traceable in part to the Prince's Case, that executive action which alters the law of the land requires parliamentary authorisation.

The case is also significant as an illustration of the broader constitutional contribution of Sir Edward Coke, who used his position on the bench to develop a systematic account of the common law as a constitutional constraint upon royal power. The Prince's Case, read alongside Coke's other great constitutional decisions and writings, reveals an early and sophisticated account of the separation of legislative and executive functions that anticipates much later constitutional thinking. Coke's insistence that the common law and Parliament together constituted a legal framework within which even the Crown must operate laid important intellectual groundwork for the eventual consolidation of parliamentary sovereignty as the central organising principle of the British constitution.

For students of public law, the Prince's Case serves as a foundational authority for the proposition that the prerogative is a residual power defined and limited by law, not an inherent sovereign authority standing above it. This understanding of the prerogative as legally bounded and judicially reviewable has continued to develop through the subsequent centuries and remains central to modern constitutional law, as reflected in the landmark decision of the House of Lords in Council of Civil Service Unions v Minister for the Civil Service [1985] AC 374, which confirmed that the exercise of prerogative powers is in principle subject to judicial review. The intellectual lineage connecting these modern authorities to the reasoning of the Prince's Case underscores the enduring constitutional significance of this early Jacobean judgment.