WI: Simon de Montfort Defeats Edward Longshanks?

What if Simon de Montfort Defeats Edward Longshanks?

In OTL the Battle of Evesham was a very one sided victory for Edward Longshanks. What if instead Edward Longshanks had of been defeated, captured and or killed? What would de Montfort do going forward? Could any of his reforms last?
 
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