Henry II changed the English legal system by pulling justice out of the hands of local lords and rebuilding it as a single royal operation that reached every county. Between 1154 and 1189 he sent salaried judges on circuit, replaced trial by ordeal and battle with juries of local men, and channeled disputes through standardized written orders called writs. The result was a body of law applied consistently across the kingdom, which is why historians credit his reign with the birth of the English common law.
The Wreckage He Started With
Henry came to the throne after nearly two decades of civil war between King Stephen and Empress Matilda, the period known as the Anarchy (1138–1153). Royal courts barely functioned outside London. Barons ran their own courts on their own terms, and the outcome of a case depended largely on whose land you stood on. Sheriffs, meant to enforce royal law locally, had drifted into acting as independent power brokers who enriched themselves. Restoring order was the immediate task; building something that would not collapse again was the larger one.
Royal Judges on Circuit
Rather than requiring subjects to travel to the king, Henry sent the king’s authority out to them. Royal judges, called Justices in Eyre, rode set circuits through the counties. Financial records suggest the first circuits began in the mid-1160s, and by 1176 there were six formal circuits covering England.1The National Archives. Courts of Law Records From the Medieval Period General Eyres The same legal standards applied whether the court sat in Yorkshire or Devon.
The circuits did two things at once. Ordinary people who could never afford a trip to Westminster now had access to royal justice, and feudal courts steadily lost business because litigants preferred the more consistent, less obviously biased royal alternative.
Cleaning Out the Sheriffs
In 1170 Henry launched the Inquest of Sheriffs, a sweeping investigation that ordered local men to testify under oath about what their sheriffs and bailiffs had taken from them. Twenty-one of the twenty-eight sheriffs in England were removed and replaced. The message was blunt: royal officials answered to the king, not to local custom or their own appetites.
A Dedicated Court for Civil Disputes
In 1178 Henry assigned five members of his council specifically to hear civil disputes between private parties.2Encyclopaedia Britannica. Court of Common Pleas They still traveled with the royal court, but the idea that civil litigation deserved dedicated judges had taken hold. Magna Carta in 1215 would later require this body to sit at a fixed location, and it became the Court of Common Pleas at Westminster Hall.
Juries in Place of Ordeal and Battle
Before Henry, English courts often decided cases by ordeal or by battle. A defendant might plunge a hand into boiling water or carry a red-hot iron, with a clean-healing wound taken as proof of innocence. Parties or their champions might fight for a verdict. Henry did not abolish these methods outright, and trial by ordeal continued until 1215, when the Fourth Lateran Council forbade clergy from blessing the rituals. What he did instead was build something better beside them, which gradually drained them of use.
The Assize of Clarendon
The Assize of Clarendon in 1166 created what became the grand jury. In every hundred, twelve local men, along with four from each township, had to swear an oath and report to royal justices anyone in the community suspected of robbery, murder, or theft.3The Avalon Project. Assize of Clarendon 1166 Instead of waiting for a victim to accuse or a lord to decide who deserved punishment, the community itself flagged suspects. Public prosecution starts here.
The Assize of Northampton
Ten years later, the Assize of Northampton in 1176 extended the list of crimes jurors had to investigate to include arson and forgery, and stiffened the penalties. A person who failed the ordeal now lost a hand as well as a foot.4Constitution Society. Sources of English Constitutional History – The Assize of Northampton It also formalized the circuit system into six groups, each with a panel of three judges.5Wikisource. 1911 Encyclopaedia Britannica – Northampton, Assize of
The Petty Jury
A second kind of jury emerged in civil cases. When Henry’s writs put a land dispute before the royal courts, panels of local men, usually twelve, were called to answer specific factual questions: who had held the land, whether a dispossession was wrongful, whether an heir was entitled to inherit. These panels became the petty or trial jury. Because the jurors typically knew the facts firsthand, their answers carried a practical weight that ordeals and duels never had.
Writs: The Standardized Procedures
Henry’s system ran on paperwork. A royal writ was a formal written order from the king’s chancery, and to bring a case in a royal court you needed the right one. Specific writs handled specific problems, which forced disputes into predictable channels and let judges across England apply the same procedures to the same kinds of cases.
The Petty Assizes
Three writs, known together as the petty assizes, addressed the most common source of conflict: land.
- Novel disseisin: if someone seized your land without a court judgment, a jury of twelve local freemen would decide whether the dispossession was wrongful and, if so, order the land restored.6The Avalon Project. Magna Carta – Definitions
- Mort d’ancestor: an heir who found a lord or neighbor had grabbed the inheritance could demand a jury inquiry into what the deceased had held at death and whether the claimant was the rightful heir.7Encyclopaedia Britannica. Mort d’ancestor
- Darrein presentment: introduced around 1179, this writ resolved disputes over who had the right to appoint a clergyman to a church position, by asking a jury who had last made such an appointment.
The petty assizes drew business away from feudal courts because they were fast, predictable, and grounded in what local people actually knew.
The Writ of Right
Older than the petty assizes, the writ of right dealt with the ultimate question of land ownership. It commanded a feudal lord to “do full right” to a claimant, and if the lord failed to act, the case moved into a royal court.8Internet History Sourcebooks Project. The Forms of Action at Common Law The mere existence of the writ pushed lords to handle disputes fairly, because the alternative was losing jurisdiction entirely.
Glanvill’s Treatise
By the end of Henry’s reign the accumulated writs, procedures, and decisions needed a guidebook. The Tractatus de legibus et consuetudinibus regni Angliae, written around 1187–1189 and known as Glanvill after the chief justiciar to whom it was attributed, catalogued the writs available in royal courts and explained how cases moved through them.9Cornell University Library. A Translation of Glanville by John Beames It captured a legal system that had become coherent enough to be taught.
The Limit: The Church Kept Its Own Courts
Henry’s centralization did not extend to the Church. In 1164 he issued the Constitutions of Clarendon, sixteen articles meant to bring clergy accused of secular crimes, the so-called criminous clerks, under royal jurisdiction, along with other restrictions on the Church’s independence.10The Avalon Project. Constitutions of Clarendon Archbishop Thomas Becket resisted, was murdered in Canterbury Cathedral on December 29, 1170 by four of Henry’s knights, and became a saint almost overnight.11Encyclopaedia Britannica. Constitutions of Clarendon In the 1172 Compromise of Avranches, Henry conceded that criminous clerks would remain under Church jurisdiction. Church courts kept their independence for centuries afterward, and Henry’s legal revolution stopped at their door.
Why It Added Up to Common Law
The phrase “common law” describes what Henry produced. Before his reforms, England had customary laws in the plural, differing from shire to shire and manor to manor. He did not invent new principles from scratch. He consolidated local customs, kept the workable ones, and pushed them through a single royal machinery of judges, juries, and writs until the same law applied everywhere. Each ruling became a reference point for the next, and the system started reinforcing itself.
The institutions have lasted. The grand jury survived in recognizable form for more than eight centuries. Deciding disputes with a panel of local people rather than by combat or supernatural signs became foundational across the English-speaking world. The writ system established the principle that access to justice runs through standardized, predictable procedures rather than a lord’s discretion. The architecture Henry put in place, centralized authority, professional judges, community fact-finding, and written procedure, turned out to be what law needed in order to work at scale.