William Blackstone’s legal theory rests on a single ordering claim: natural law, given by God and discoverable through reason, sits above every rule any government can make, and human law is legitimate only so far as it stays within that higher order. He worked this claim out across the four volumes of his Commentaries on the Laws of England, published between 1765 and 1769, building from it a theory of judging, a catalog of individual rights, an account of where property and civil society come from, and a picture of the English constitution as a balanced machine.1Project Gutenberg. Commentaries on the Laws of England, Book the First Blackstone was the first Vinerian Professor of English Law at Oxford, later solicitor-general to Queen Charlotte, and from 1770 a justice of the Court of Common Pleas, and his book became the primary legal textbook in the American colonies and one of the most frequently cited works in U.S. Supreme Court decisions for more than two centuries.
How Blackstone Defined Law
Blackstone defined law in its broadest sense as “a rule of action, which is prescribed by some superior, and which the inferior is bound to obey.” For human beings, the superior is God, and the rule is what Blackstone called the law of nature: a set of principles woven into creation, discoverable through reason. Because God made people with free will and then established immutable guidelines for how that freedom should operate, natural law in Blackstone’s account is something people uncover rather than invent.
Where reason falls short, divine revelation fills the gap. Scripture clarifies moral duties that unaided intellect might miss, providing a second layer beneath the overarching natural law. The practical consequence of this hierarchy was radical: no law made by any government anywhere could be valid if it contradicted natural or revealed law.2University of Texas at Austin Liberal Arts Instructional Technology Services. Commentaries on the Law of England – Section 2: Of the Nature of Laws in General Every human-made rule derived its force, directly or indirectly, from that original source.
Beneath these higher laws sits municipal law, which governs the day-to-day affairs of a particular country. Blackstone defined it as “a rule of civil conduct prescribed by the supreme power in a state, commanding what is right and prohibiting what is wrong.”3Online Library of Liberty. Commentaries on the Laws of England Municipal law handles the specific needs of a society but remains legitimate only within the boundaries set by higher law. A statute that conflicts with natural law, in Blackstone’s framework, is not really law at all.
Bentham’s Challenge to the Natural Law Framework
Not everyone found this framework convincing. Jeremy Bentham launched the most famous assault on it in A Fragment on Government (1776), arguing that treating existing law as inherently just left no room for reform. If every valid law must already conform to natural law, then changing any law would seem to make it less just, an absurdity that would freeze legal progress in place.
Bentham drew a sharp line between two roles he accused Blackstone of blurring together. The “expositor” describes what the law actually is; the “censor” evaluates what the law ought to be. Blackstone, Bentham said, kept slipping between these roles, using the language of natural law to dress up the status quo as morally inevitable. By conflating morality with judge-discovered law, Blackstone made it nearly impossible to criticize existing rules on their own terms. This critique became the intellectual seed of legal positivism, the school of thought that insists law and morality are separate questions.
Judges as Discoverers, Not Makers, of Law
Blackstone’s picture of judging follows directly from his picture of law. He described judges as “the depositary of the laws; the living oracles, who must decide in all cases of doubt, and who are bound by an oath to decide according to the law of the land.”4SUNY Cortland. Commentaries on the Laws of England A judge does not create new rules but discovers principles already present in custom, history, and prior decisions. The judge is “not delegated to pronounce a new law, but to maintain and expound the old one.”
This declaratory theory leaned heavily on stare decisis, the rule that courts should follow precedents established in earlier cases. Without that consistency, Blackstone said, the law would become “liable to waver with every new judge’s opinion” rather than remaining a stable system people could rely on.4SUNY Cortland. Commentaries on the Laws of England Prior rulings, once carefully recorded, became authoritative evidence of what the law had always been.
The most revealing part of the theory is what happens when a past decision looks wrong. Rather than treating it as bad law, Blackstone reframed the situation: the earlier judge simply failed to find the true law. The law itself remained rational and permanent; only the human effort to locate it fell short. It is an elegant move, but critics have long pointed out that it makes the legal system nearly immune to self-correction. If wrong decisions are always the judge’s error and never the law’s flaw, it becomes difficult to acknowledge that the law itself might need changing.
The Three Absolute Rights
Blackstone identified three fundamental rights belonging to every person, which he called absolute because they exist independent of any government’s grant. He reduced all civil liberties to these three categories on the logic that every form of oppression ultimately attacks one of them:
- Personal security: a person’s “legal and uninterrupted enjoyment of his life, his limbs, his body, his health, and his reputation.” The law backed this right with specific remedies, including actions for assault and battery.5The University of Chicago Press. Amendment IX: William Blackstone, Commentaries 1:120-41
- Personal liberty: the “power of locomotion, of changing situation, or removing one’s person to whatsoever place one’s own inclination may direct; without imprisonment or restraint, unless by due course of law.” The writ of habeas corpus served as the primary enforcement tool.6University of Chicago Press. William Blackstone, Commentaries 3:129-37
- Private property: the “free use, enjoyment, and disposal of all his acquisitions, without any control or diminution, save only by the laws of the land.”5The University of Chicago Press. Amendment IX: William Blackstone, Commentaries 1:120-41
Alongside these, Blackstone described what he called auxiliary rights: procedural safeguards that protect the three substantive freedoms when they come under threat. These included access to the courts, the right to petition the government, and the right to have arms for self-defense. He defined the last as “a public allowance, under due restrictions, of the natural right of resistance and self-preservation, when the sanctions of society and laws are found insufficient to restrain the violence of oppression.”7The Founders’ Constitution. Amendment II Arms in that framing are not an end in themselves but a backstop when ordinary legal channels fail.
Blackstone acknowledged that absolute rights had been “depressed by overbearing and tyrannical princes” at various points in English history. His preferred remedy, however, was institutional rather than revolutionary. When fundamental rights came under attack, they were “asserted in parliament,” as happened when the Great Charter was “obtained, sword in hand, from king John.”5The University of Chicago Press. Amendment IX: William Blackstone, Commentaries 1:120-41 Parliamentary assertion and constitutional reform were the legitimate channels for restoring lost liberties. He stopped short of endorsing anything resembling a general right of insurrection, a careful position for someone writing within a monarchy, and one that American readers later read quite differently than he intended.
Property as the Origin of Civil Society
Blackstone traced property rights back to a philosophical starting point where the earth belonged to everyone. All resources were “the general property of all mankind, exclusive of other beings, from the immediate gift of the creator.”8Online Library of Liberty. Blackstone on Property In this original state, no one held permanent ownership over anything. A person who sat in a clearing or gathered fruit had a temporary claim lasting only as long as they physically occupied or used the resource. Walk away, and anyone else could claim it.
The arrangement collapsed as populations grew. No one would invest the labor of farming or building a dwelling if any stranger could take it the moment the builder stepped away. Agriculture demanded a more durable form of ownership. Labor became the moral foundation for private property: when someone worked the soil or improved raw materials, the effort they invested created a claim that justified excluding everyone else.9Avalon Project. Blackstone’s Commentaries on the Laws of England – Book the Second – Chapter the First This logic mirrors John Locke’s labor theory of property, and Blackstone drew on it explicitly.
The final step in the account was the creation of civil society itself. Permanent property demanded enforcement: rules about inheritance, sale, and trespass, along with courts to resolve disputes. “Necessity begat property; and, in order to insure that property, recourse was had to civil society,” which brought along government, laws, and everything that followed.9Avalon Project. Blackstone’s Commentaries on the Laws of England – Book the Second – Chapter the First In this telling, property does not come from the state. The state comes from property.
The English Constitution and Parliamentary Sovereignty
Blackstone described the English constitution as a carefully balanced machine. Three distinct powers pulled in different directions: the monarchy, the aristocracy in the House of Lords, and the democratic element in the House of Commons. “Like three distinct powers in mechanics, they jointly impel the machine of government in a direction different from what either, acting by themselves, would have done; but at the same time in a direction partaking of each.”10The University of Chicago Press. William Blackstone, Commentaries 1:149-51, 156-57 Each branch checked the others: the people checked the nobility, the nobility checked the people, and the King checked both. The mutual friction was not a defect but the point.
Within that structure, Blackstone located a supreme authority. Parliament’s “power and jurisdiction,” he wrote (quoting Sir Edward Coke), “is so transcendent and absolute, that it cannot be confined, either for causes or persons, within any bounds.” Parliament could make, repeal, enlarge, or restrict any law on any subject. He went further: “what they do, no authority upon earth can undo.”10The University of Chicago Press. William Blackstone, Commentaries 1:149-51, 156-57
There is a tension here that Blackstone never fully resolved. If Parliament is truly omnipotent, what happens when it passes a law that contradicts natural law? Earlier in the Commentaries, he had insisted no human law conflicting with natural law could be valid. But if no earthly authority can undo an act of Parliament, the natural law limitation becomes essentially theoretical. Bentham seized on this contradiction. Later constitutional thinkers largely set the natural law piece aside and treated parliamentary sovereignty as the operating principle.
Separation of Powers and Judicial Independence
Blackstone argued that the legislative and executive powers needed to overlap partially rather than remain completely separate. Total separation, he warned, would eventually produce the same tyranny as total union. The King needed to participate in legislation, but only through the power of rejection, allowing the crown to block harmful changes without initiating new law on its own.11The Founders’ Constitution. William Blackstone, Commentaries
Judicial power, however, demanded a stricter separation. Blackstone called an independent judiciary “one main preservative of the public liberty” and insisted it remain separate from both the legislature and the executive. If judicial power merged with legislative authority, life and property would be subject to “arbitrary judges, whose decisions would be then regulated only by their own opinions.” If judicial power merged with executive authority, the combined weight would overpower the legislature entirely.11The Founders’ Constitution. William Blackstone, Commentaries He pointed to the abolition of the Star Chamber as proof of what goes wrong when the executive controls the courts.
The Blackstone Ratio
Blackstone’s most enduring commitment in criminal law appears in a single sentence near the end of the Commentaries. Writing about the dangers of convicting someone on circumstantial evidence, he concluded: “the law holds, that it is better that ten guilty persons escape, than that one innocent suffer.”12Avalon Project. Blackstone’s Commentaries on the Laws of England – Book the Fourth – Chapter the Twenty-Seventh: Of Trial and Conviction
The idea was not entirely original. Earlier thinkers had expressed similar sentiments with different ratios. But Blackstone’s specific formulation caught hold and became the standard shorthand for the presumption of innocence in Anglo-American law. The Blackstone ratio, as it came to be known, captures a utilitarian argument: false convictions are so destructive to individual liberty and public trust in the justice system that tolerating some guilty people going free is a price worth paying. Modern proof-beyond-a-reasonable-doubt standards trace their philosophical roots to this commitment, and the ratio still surfaces in debates about criminal procedure, sentencing reform, and evidentiary standards.
Why Blackstone Still Matters in American Law
The Commentaries arrived in the American colonies at precisely the moment they were most needed. Colonial lawyers had no organized body of English law to work from, and Blackstone’s readable, systematic treatment filled the gap. By the time the Revolution arrived, his four volumes were among the most widely owned legal texts in North America. A work celebrating the English constitution became the intellectual toolkit for building an independent republic.
The framers drew heavily on Blackstone’s vocabulary and concepts while modifying them for a system without a king. Terms like “habeas corpus” and “ex post facto” carried the precise meanings he had defined. The Bill of Rights reflected his influence in several specific ways. The Seventh Amendment expressly tied the right to civil jury trials to English common law, a tradition the Commentaries had documented at length. The Fourth Amendment’s restrictions on general warrants addressed abuses Blackstone had discussed. His treatment of the right to bear arms as an auxiliary right of self-preservation reappeared in the Second Amendment and was cited extensively by the Supreme Court in District of Columbia v. Heller (2008).7The Founders’ Constitution. Amendment II
The founders also diverged from Blackstone in revealing ways. He had argued that while government licensing and prior restraint of the press were impermissible, the government could punish someone after the fact for publishing seditious material. The First Amendment’s framers, James Madison among them, accepted his opposition to prior restraint but rejected his tolerance for seditious libel prosecutions. American revolutionaries took his cautious right of parliamentary resistance and transformed it into something far more radical: a natural right to overthrow tyrannical government entirely. They read his work through revolutionary lenses he would not have recognized.
The Commentaries remain one of the most frequently cited historical authorities in American case law, invoked from the ratification debates of the 1780s through twenty-first-century Supreme Court opinions. When justices want to establish what a constitutional provision meant to the people who wrote it, Blackstone’s text is often the first place they look.