WI Simon de Montfort deposes King Henry III and becomes King of England in 1264?

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?
 
Huh, I've little knowledge on anything English at all, but what I do know might come off this would be that Wales would find itself in an extremely good situation. Simon would still be in trouble when Edward arrives however, I'm sure, but before that he made a deal with Llywelyn that he'd recognize his right to rule Wales and pretty much gave him a free pass to assault the Marcher Lords.

EDIT: You started this thread because today is the anniversary of Lewes, didn't you? I only just noticed when I went to look at the new Wikipedia. Funny, as today is also the release of Robin Hood, although he has little at all to do with the Baronial Wars.

EDIT2: Huh, seems I'm wrong about the whereabouts of Edward in this period as wiki states he was captured at Lewes. Damn you Medieval 2: Total War! Anyways, that just means I'm even less sure of what goes down. Does Edward still escape? Do the people get even angrier at Simon? The Marcher Lords are not pleased for sure, among others.
 
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Huh, I've little knowledge on anything English at all, but what I do know might come off this would be that Wales would find itself in an extremely good situation. Simon would still be in trouble when Edward arrives however, I'm sure, but before that he made a deal with Llywelyn that he'd recognize his right to rule Wales and pretty much gave him a free pass to assault the Marcher Lords.

EDIT: You started this thread because today is the anniversary of Lewes, didn't you? I only just noticed when I went to look at the new Wikipedia. Funny, as today is also the release of Robin Hood, although he has little at all to do with the Baronial Wars.

EDIT2: Huh, seems I'm wrong about the whereabouts of Edward in this period as wiki states he was captured at Lewes. Damn you Medieval 2: Total War! Anyways, that just means I'm even less sure of what goes down. Does Edward still escape? Do the people get even angrier at Simon? The Marcher Lords are not pleased for sure, among others.

Haha indeed... Today is the anniversary of the battle of Lewes... People were already angry with John Lackland (Henry's father) so a humiliated King isnt any better than an incompetent King... Anyway if Simon became a pain in the ass for the Lords or proves to be incompetent then the Barons could always call upon the French King to intervene (they did it once in the first Baron's War when they called future Louis VIII to assume the Crown...)
 
From what I recall, one of the reasons that Simon lost support among the Barons was fear he'd depose, execute, and replace the King; i.e the Barons's revolt leads to a replacement King rather than regaining/improving their rights and powers which is why they rebelled in the first place.

If Simon does replace Henry (and probably Edward too) then it creates the precedent of a diminished Right by Blood and thus decreases any authority of the King thus inviting any Baron strong enough to depose him - not a good precedent for consolidating national power.

So we basically get a prolonged Roses type situation with multiple competitors until one is strong enough to reassert the Right of Blood.
 
From what I recall, one of the reasons that Simon lost support among the Barons was fear he'd depose, execute, and replace the King; i.e the Barons's revolt leads to a replacement King rather than regaining/improving their rights and powers which is why they rebelled in the first place.

If Simon does replace Henry (and probably Edward too) then it creates the precedent of a diminished Right by Blood and thus decreases any authority of the King thus inviting any Baron strong enough to depose him - not a good precedent for consolidating national power.

So we basically get a prolonged Roses type situation with multiple competitors until one is strong enough to reassert the Right of Blood.

I dont think that if Simon usurped the Crown would have set the precedent of diminished right by blood... He had ties with royal family through his marriage to Eleanor sister of Henry III and his ancestor Bertrada de Montfort was married to the royal family... However if he feared that he might have set this precedent he could push his son Henry to the throne as Henry IV since he was nephew of the "deposed" Henry III...
 
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