The Origins of the Common Law

Introduction

The common law is the legal system that originated in England after the Norman Conquest of 1066 and developed through judicial decisions rather than legislative codes. It is characterized by the doctrine of precedent (stare decisis), trial by jury, the adversarial system, and the principle that law is found in judicial decisions rather than enacted in codes. The common law tradition governs England, Wales, Ireland, the United States, Canada, Australia, New Zealand, and many Commonwealth nations — approximately one-third of the world’s population. Its evolution spans nearly a millennium of continuous development, adapting to changing social, economic, and political conditions while maintaining continuity with its medieval origins.

The Norman Conquest and Royal Justice

The common law began with William the Conqueror’s establishment of a centralized monarchy with authority over the entire English realm. William introduced the feudal system, which created a hierarchical structure of land tenure that became the foundation of English property law. More importantly, the Norman kings claimed authority over the entire kingdom, displacing the local customary law of Anglo-Saxon England with uniform royal justice.

The critical institutional developments occurred under Henry I (1100–1135) and particularly Henry II (1154–1189). Henry II created the Curia Regis (King’s Council) as a permanent court, sent itinerant justices (justices in eyre) throughout the country to hear cases in local communities, and introduced the assize system — standardized procedures for resolving land disputes through royal writs and jury verdicts. The Assize of Clarendon (1166) and the Assize of Northampton (1176) established procedures for criminal justice, creating the grand jury system and standardizing criminal procedure. Henry II’s legal reforms were so significant that he is sometimes called the “father of the common law.” By making royal justice available throughout the kingdom, he established the principle that there was a single law common to all England.

The Writ System

Early common law operated through writs — formal written commands from the King’s Chancery authorizing legal action in the royal courts. Each writ created a specific cause of action with its own procedure, pleading requirements, and remedy. The Register of Writs catalogued available remedies. If no writ existed for a grievance, there was no remedy in the royal courts — the maxim ubi remedium, ibi ius (where there is a remedy, there is a right) expressed the writ system’s centrality. The writ system became rigid over time, as the barons resisted the creation of new writs without consent.

The Statute of Westminster II (1285) authorized the Chancery to issue writs in cases similar to existing writs (in consimili casu — in like case), providing limited flexibility. This led to the development of the action of trespass and its offspring — trespass on the case, assumpsit (for breach of promise), trover (for conversion of goods), and indebitatus assumpsit (for debt) — which became the foundation of modern tort and contract law. The writ system was abolished by the Judicature Acts 1873–1875, but its influence persists in modern pleading, the structure of legal remedies, and the common law’s preference for procedural remedies over substantive rights.

The Three Common Law Courts

Three central courts emerged from the Curia Regis, each with distinct jurisdiction. The Court of Exchequer originally handled financial disputes involving royal revenue but expanded its jurisdiction through the fiction that the plaintiff was a debtor of the king. The Court of Common Pleas heard private litigation between subjects, becoming the principal forum for ordinary civil disputes. The King’s Bench exercised jurisdiction over cases involving the Crown and developed a supervisory jurisdiction over inferior courts through writs of certiorari, prohibition, and mandamus.

These courts competed for business, developing distinct procedures and remedies. Their competition fostered legal innovation: the King’s Bench developed the action of assumpsit to remedy breaches of informal promises, laying the foundation of modern contract law; the Common Pleas continued the traditional forms of action; the Exchequer developed equitable remedies. The Court of Chancery, which developed separately under the Lord Chancellor, provided equitable relief when the common law courts’ remedies were inadequate — issuing injunctions, orders for specific performance, and recognizing trusts. The tension between common law and equity was resolved by the Judicature Acts, which merged the courts while preserving the distinction between legal and equitable rules.

The Development of Stare Decisis

The doctrine of stare decisis — to stand by things decided — developed gradually as law reports became available and courts established hierarchies. The earliest law reports were the Year Books (circa 1270–1535), anonymous reports of arguments and decisions in the royal courts, written in law French. The Year Books recorded the arguments of counsel and the opinions of judges, providing material for later lawyers to argue from precedent. After the Year Books ceased, private reporters — Plowden, Coke, Saunders, Burrow — published named reports that became authoritative. Sir Edward Coke’s Reports (1600–1615) and his Institutes of the Lawes of England (1628–1644) systematized the common law and established Coke as the greatest common lawyer of his age.

By the eighteenth century, the doctrine of precedent was firmly established. Sir William Blackstone’s Commentaries on the Laws of England (1765–1769) provided the first comprehensive treatise on English law, presenting the common law as a rational, coherent system. Blackstone’s Commentaries shaped legal education in England and, particularly, in the American colonies, where they became the foundation of legal training.

Lord Mansfield’s Reforms

Lord Mansfield, Chief Justice of the King’s Bench from 1756 to 1788, transformed English commercial law. A Scottish-born lawyer with a civilian background, Mansfield brought a comparative perspective to English law, drawing on Roman law and continental commercial practice. He modernized the law of contract and commercial instruments, established the principles of insurance law, and developed the concept of negotiability for bills of exchange and promissory notes. Mansfield integrated the law merchant (lex mercatoria) into the common law, creating a body of commercial law that could support England’s expanding trade and empire. His procedural reforms made the King’s Bench faster and more efficient than its competitors, attracting the bulk of commercial litigation.

The Judicature Acts 1873–1875

The Judicature Acts of 1873–1875 fundamentally restructured the English courts. They abolished the separate common law courts (King’s Bench, Common Pleas, Exchequer) and the Court of Chancery, replacing them with a single Supreme Court of Judicature comprising the High Court (with divisions reflecting the old courts’ jurisdictions) and the Court of Appeal. The Acts also abolished the forms of action, ending the writ system’s procedural stranglehold. Law and equity were to be administered concurrently: where they conflicted, equity prevailed. The Judicature Acts modernized English procedure, creating a unified court system capable of handling all legal business efficiently.

Global Spread Through the British Empire

The common law spread across the globe through British colonialism. It was received in the American colonies (becoming the foundation of U.S. law after independence), Canada (both the common law provinces and Quebec’s civil law tradition), Australia (beginning with the First Fleet in 1788), New Zealand, India, and numerous territories in Africa, Asia, and the Caribbean. The common law was usually received through a “settlement” doctrine: when English settlers established colonies in terra nullius (land belonging to no one), they brought English law with them; when territories were conquered or ceded, existing law continued until modified by the colonial power. India’s legal system was transformed by British rule: the Hastings plan (1772) and Macaulay’s Indian Penal Code (1860) created a common law system adapted to Indian conditions. The Judicial Committee of the Privy Council served as the final court of appeal for the Empire, promoting uniformity across the common law world. After independence, most former colonies retained the common law while developing distinct national legal systems, creating the diverse family of common law jurisdictions that exists today.