How did the Battle of Bouvines contribute to King John’s acceptance of Magna Carta?

The Battle of Bouvines in 1214 was a decisive military defeat for King John of England and his coalition, which included Holy Roman emperor Otto IV. This loss, coupled with the failure of John's own campaign in Poitou, left the English king severely weakened both financially and politically.12

Having exhausted his resources on costly and unsuccessful military efforts to reclaim lands lost to the French king Philip II, John returned to England to face a growing rebellion among his barons. These barons were already disgruntled by John’s heavy taxation, his oppressive rule, and his disregard for feudal law and custom. The collapse of his international coalition at Bouvines stripped John of his remaining leverage, leaving him unable to suppress the opposition. Consequently, he was forced to meet the rebellious barons at Runnymede in 1215, where he was compelled to accept the Magna Carta.12