By spring 1215 King John had alienated almost every constituency in the English political nation. The 1204 loss of Normandy to the French king Philip Augustus had cost the Angevin Crown its continental power base. The 1213 papal Interdict over the disputed Canterbury succession had cost John the support of the Catholic Church and forced him to accept England as a papal fief. The successive heavy taxation campaigns to fund attempted recovery of Normandy had alienated the baronage.

In May 1215 a coalition of approximately 40 senior barons formally renounced their feudal homage to John and seized London. The king’s negotiating position collapsed within weeks. Negotiations between the rebel baronial leadership — led by the elder statesman William Marshal and the new Archbishop of Canterbury Stephen Langton — and the king were conducted at Runnymede meadow, a midway point between the royal castle at Windsor and the rebel-controlled city of London.

15 June 1215

The Articles of the Barons were presented to John on approximately 10 June. Negotiations refined the document over five days. On 15 June 1215 John affixed his royal seal to the modified document — now titled the Magna Carta Libertatum (“Great Charter of Liberties”) — and copies were prepared for distribution.

The original 1215 text comprised 63 chapters dealing with three principal categories of grievance.

The first was specific feudal-incidence reform: limits on the financial reliefs the king could demand from heirs, restrictions on his rights over heiresses and widows, protections of forest law against arbitrary enforcement.

The second was administrative reform: regulations of the royal financial offices, restrictions on the king’s military service requirements, protections against the arbitrary seizure of property and labour.

The third — and the chapters that have had the longest constitutional afterlife — included Chapter 39 (no free man may be imprisoned, dispossessed, or destroyed except by the lawful judgment of his peers or the law of the land) and Chapter 40 (no one may sell, deny, or delay justice). These two chapters are the textual foundation of the modern Anglo-American doctrine of due process. They were not original to 1215 — they restate principles that were already present in 12th-century Anglo-Norman legal practice — but their authoritative statement in the sealed charter gave them a documentary specificity that subsequent English common law would build on.

The machinery of enforcement was Chapter 61: a committee of 25 barons with the legal right to seize the king’s property if he violated the charter. The chapter was a constitutional innovation. It was also why the charter could not survive in its 1215 form.

24 August 1215

John applied to Pope Innocent III for annulment within weeks of the sealing. England was a papal fief; Innocent had the legal authority to disallow agreements made by his vassal. The papal bull Etsi karissimus was issued at the papal court at Anagni on 24 August 1215, ten weeks after the Runnymede sealing. It annulled the charter as “shameful, demeaning, illegal and unjust” — and specifically as having been extorted from John by force.

John repudiated the charter the same week. The barons’ Chapter 61 enforcement committee, having lost its papal cover, was now in armed rebellion. The First Barons’ War began in September 1215. The rebels invited the French king’s son Prince Louis (later Louis VIII) to take the English throne. Louis landed in Kent in May 1216 and was proclaimed king in London by the rebel barons.

What saved the charter

John died of dysentery at Newark on 18 October 1216, aged 49. His 9-year-old son became Henry III under the regency of William Marshal. Marshal — who had been on the royalist side throughout the war but had been a principal Runnymede negotiator on the king’s behalf — made the political calculation that the surviving rebel barons would be more easily reconciled to the new young king if the charter were reissued.

The charter was reissued in modified form in November 1216, with the Chapter 61 enforcement committee deleted and the most politically contentious clauses softened. It was reissued again in November 1217 with further modifications. The third reissue in 1225 was the version that became canonical. The 1225 Magna Carta was confirmed by 30 successive English monarchs over the following four centuries and is the version that survives in 21st-century English statute law.

Four 1215 originals survive — at the British Library (two), Salisbury Cathedral, and Lincoln Cathedral. The 1297 reissue copy held at the National Archives of the United States in Washington is the source of the canonical text used by most modern American constitutional commentary.

The charter the English barons forced on King John in a Surrey meadow in June 1215 was technically a 10-week political failure. It survives in 21st-century law because of what its 1225 successor became.