The First Barons' War, was a civil war in the Kingdom of England, fought between June 1215 and May 1217. A group of rebellious major landowners, commonly referred to as barons, led by Robert Fitzwalter and supported by a French army under the future Louis VIII of France, made war on King John of England. The king's refusal to accept and abide by the Magna Carta which he had sealed on 15 June 1215, provoked war, giving rise to the barons offering the crown to Louis, Dauphin of France. King John's death in October 1216 and the reissue of the Magna Carta by the regent of his son Henry III, prevented a major civil war. After a year and a half of war, most of the rebellious
barons had defected. Louis VIII had to give up his claim to be the King of England by signing the Treaty of Lambeth on 11 September 1217. Louis accepted a symbolic sum to relinquish his English dominions and returned home, leaving King Henry III as the King of England, until his death on 16 Nov 1272.