In 1215, King John of England (the Sheriff of Nottingham’s evil boss in Robin Hood) was forced to sign the Magna Carta after his defeat in the First Baron’s War. The Barons revolted due to King John’s autocratic and tyrannical ways, and judicial favoritism for his supporters. The Magna Carta was a historically critical step towards rule by constitutionally bound parliamentary governments. However, the Magna Carta was just the most famous of a series edicts and documents in medieval England meant to limit the power of the king, and establish the rule of law, instead of rule at the king’s whim.
In 1264, King Henry III was the latest Anglo-Norman king to spread his chicken wings and ignore his agreements. In 1258, he and his barons signed the Provisions of Oxford. The Provisions established a permanent Privy Council of baronial and royal advisors for administration of the kingdom, and more importantly, a thrice yearly baronial council to parley with the king (a “parliament” in French) regarding all financial matters. True to form of most tyrants, King Henry III reneged on the agreement at the first opportunity. In 1263, King Henry III unilaterally raised taxes because he wanted to purchase the Kingdom of Sicily (long story). And again, his barons had to force him to comply by force of arms. The Second Baron’s War began when Simon de Montfort, the 6th Earl of Leicester, rallied the barons to force the king’s compliance with the Provisions of Oxford.
On 14 May 1264, Henry III and his son Prince Edward (the future King Edward “Longshanks”) met the barons outside of Lewes castle in Sussex, England. Henry III outnumbered the barons three to one, and Prince Edward was initially very successful leading the first charge which scattered the baronial cavalry from London on the far left of the line. However, Edward’s pursuit of the broken knights left his father uncovered. Forced to assault the baronial line unsupported, Henry’s army broke when Montford’s reserve smashed into Henry’s flank. Upon seeing the assault, the baronial yeomen and levy charged off the hill they were defending, routed the remainder of the King’s army, and seized the king. When Prince Edward’s victorious, but exhausted, forces returned to the battlefield, they were promptly defeated.
King Henry III was forced to sign the Edict of Lewes reaffirming the Magna Carta and the Provisions of Oxford. Prince Edward was held as a hostage to assure compliance and the battle led to the first session of the newly established parliament. However, Edward escaped later in the year and Henry III immediately tore up the Edict of Lewes, and vowed never to call a parliament again. Through Edward’s prowess, Henry III eventually fought the Barons to a negotiated settlement after a costly three years of war. But the barons fought on far longer than Henry assumed possible. This wasn’t lost on the young Edward.
Though successful, the Second Baron’s War taught Edward the hard lesson that he needed his subjects’ input in governing the kingdom. This was especially true if he was going to expand into Wales and Scotland, and retain Plantagenet lands in France. When he was crowned in 1272, King Edward I permanently established the English Parliament, in effect giving more than what the barons demanded, and fought for, during the war.