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First Barons' War (1215–17)
http://en.wikipedia.org/wiki/First_Barons%27_War
The First Barons' War (1215–17) was a civil war in the Kingdom of England in which a group of rebellious 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 war resulted from the king's refusal to accept and abide by the Magna Carta he had sealed on 15 June 1215, and from the ambitions of the French prince, who dragged the war on after many of the rebel barons had made peace with John.
Result
French invasion and 16-month occupation of England eventually repelled. Return to status quo ante bellum, with some monarchic concessions to the rebellious barons.
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