Henry V and the Dowager Queen

Henry IV of England had plans to marry his son, Henry V, to Richard II's widow, Isabelle de Valois. This didn't happen and Henry V later married her much younger sister, Catherine, who after his death became Mrs. Tudor. In the meantime Isabelle married her second cousin, the later father of Louis XII, but died in childbed.

What if Hal and Isabelle (Charles VI's eldest daughter) had married? How would a Henry V married to her and not Charles' second youngest surviving child affect the 100YW? Also, I'm not aware of Isabelle's daughter suffering from whatever-it-was that led to Charles' nickname of le fou, but that could just be the knit one, skip one, slip one of genetics.
 
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I was also thinking that even if Isabelle dies as OTL, the chances of Henry V wedding her younger sister Catherine are small, so he'll probably marry elsewhere, but IDK who.
 
Well, if Henry V had married Isabella, there wouldn't have been children immediately, given that she would have only been roughly ten years old at the time (Richard II had married her when she was at the tender age of six). He would have had to wait a couple of years before consummating the marriage. Still, if he had and then he and Isabella had a family, then his heirs would certainly have been older once he went off to achieve immortality at Agincourt and ultimately die later on. That might have avoided a prolonged regency, which can only mean good things.

If Isabella died as in OTL, as long as Henry had a few healthy heirs, he might not necessarily have bothered remarrying. He was barely interested in the whole situation at best, preferring militaristic exploits. If he needed a hostess for certain things, he had his sisters (if they were still unmarried at this point) or his sisters-in-law. If he did conquer France, then he was already a son-in-law of Charles VI, and the father of that king's grandson, so there would be no need to marry Catherine to unite the two lines. It was already done.
 
The marriage means Henry V dies leaving an older heir but most likely does not go to war at the same time/under the same conditions, thus depriving himself of his OTL victories and triumphant adoption as heir to the French throne.
 
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