Over the course of King John's reign, a combination of higher taxes, unsuccessful wars and conflict with the Pope made King John unpopular with his barons. In 1215, some of the most important barons rebelled against him. He met their leaders along with their French and Scot allies at Runnymede, near London on 15 June 1215 to seal the Great Charter (Magna Carta in Latin), which imposed legal limits on the king's personal powers. But as soon as hostilities ceased, John received approval from the Pope to break his word because he had made it under duress. This provoked the First Barons' War and a French invasion by Prince Louis of France invited by a majority of the English barons to replace John as king in London in May 1216. John travelled around the country to oppose the rebel forces, directing, among other operations, a two-month siege of the rebel-held Rochester Castle.

At the end of the 16th century, there was an upsurge in interest in Magna Carta. Lawyers and historians at the time believed that there was an ancient English constitution, going back to the days of the Anglo-Saxons, that protected individual English freedoms. They argued that the Norman invasion of 1066 had overthrown these rights, and that Magna Carta had been a popular attempt to restore them, making the charter an essential foundation for the contemporary powers of Parliament and legal principles such as habeas corpus. Although this historical account was badly flawed, jurists such as Sir Edward Coke used Magna Carta extensively in the early 17th century, arguing against the divine right of kings. Both James I and his son Charles I attempted to suppress the discussion of Magna Carta. The political myth of Magna Carta and its protection of ancient personal liberties persisted after the Glorious Revolution of 1688 until well into the 19th century. It influenced the early American colonists in the Thirteen Colonies and the formation of the United States Constitution, which became the supreme law of the land in the new republic of the United States. Research by Victorian historians showed that the original 1215 charter had concerned the medieval relationship between the monarch and the barons, rather than the rights of ordinary people, but the charter remained a powerful, iconic document, even after almost all of its content was repealed from the statute books in the 19th and 20th centuries.