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This is one of the PODs that I was thinking of using for my TL.

Basically, when Richard I of England dies, both John and Arthur (http://en.wikipedia.org/wiki/Arthur_I,_Duke_of_Brittany) claim the English throne. John is crowned in Westminster with the support of Eleanor of Aquitaine. He then brings his army into France to defeat Arthur. However, in this TL, the combined forces of Arthur and Phillip II manage to defeat John. Arthur is then crowned king of England. I'm thinking of having John flee elsewhere, still claiming the throne, and having Eleanor imprisoned.

So, what would this change? Would it make sense for there to be some sort of agreement between Phillip and Arthur with Arthur giving up some of his French possessions in exchange for Phillip's help putting him on the throne? Since Arthur is only twelve, who might hold the real power during his early reign? Without Magna Carta, how might the course of English history be different?
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