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In 14 May 1264 King Henry III of England was defeated at the Battle of Lewes and forced to sign the Mise of Lewes thus making Simon de Montfort 6th Earl of Leicester the de facto ruler of England.
WI Simon de Montfort went a step further and deposed the defeated King and assuming the Crown himself as King Simon I of England? He had royal ties as husband of Henry's III sister and with the King at his mercy he could usurp the Crown...
How is this affecting History? Any thoughts?