Magna Carta Tries to Restrain a King

In June 1215, King John of England met a faction of rebel barons at Runnymede, a meadow on the south bank of the River Thames situated between the royal stronghold at Windsor Castle and the insurgent base at Staines. John had depleted royal finances and alienated much of the English nobility following military defeats in France and years of heavy feudal levies. Seeking to restore peace, Archbishop of Canterbury Stephen Langton helped mediate negotiations that transformed the barons' draft demands into a formal royal charter, granted on 15 June. The document bound the monarch to respect church privileges, protect barons from unlawful imprisonment, provide prompt justice, and place explicit limits on customary crown payments.

The 1215 agreement addressed the rights of freemen, specifically the aristocracy, while offering only limited provisions for rural serfs. It drew heavily upon the earlier Charter of Liberties issued by King Henry I alongside broader customary traditions. To guarantee compliance, the charter incorporated a security provision known as clause 61, establishing a council of twenty-five barons authorized to seize the king's castles and lands if he failed to correct alleged infractions within forty days. While European monarchs had occasionally conceded an individual subject's right to resist unjust rule, this structured apparatus for collective baronial enforcement was unprecedented in English practice.