Can he secure the French throne? Will it affect the mental state of his son Henry VI? Will it overal have positive effects on England?
Henry's V death came at the worst time for England and her new gains in France. If he lived for longer it is very possible he could keep hold of the French throne, provided he could produce viable heirs (a younger brother, or an uncle, can always act as regent to Henry VI when his mental illness manifests, or Henry VI might be bypassed in favour of another heir. His mental condition may have been inherited from his grandfather, Charles VI "the Mad", so again, entirely possible he could avoid it). Henry V will naturally face challenges from the French; governing two countries at once and travelling back and forth, rebellions, etc. Undoubtedly the riches of the (mostly) subdued French may tempt the greedy, but could also be used to bribe others (French, English, Burgundian, etc.) into loyalty. I believe Henry was more of a warrior than an administrator, but with an effective enough show of arms, he may be able to do it.
Securing England won't be easy either: his father, Henry IV, stole the throne, interrupting what had been up until then a relatively peaceful transition from father to son. Even with kings of lesser ability being forced to step down (Edward II, for example), an obvious heir, the next step in the bloodline, was available. Henry's seizure of the crown threw it all open to anyone with enough force being able to take the throne. So unless Henry V can ensure a suitable heir is around after he's gone, England will face a lot of dynastic scuffles later on.
Overall I reckon it would be fairly positive for England (and France). Henry V (and II of France)'s reign is stable if not without its troubles. The fighting between the two countries ceases, trade can resume and France's infrastructure is rebuilt, England becomes richer with the Channel trade.. Henry will have to keep Burgundy in line to stop them grabbing too much of the French croissant/Lancaster pudding if France and England quarrel. He will also have to placate both English and French nobility, the English having their institution of Parliament, the French of course without it. Perhaps a more democratic transition for France, and greater power to Parliament in England to help Henry run the country when he's abroad as a richer merchant class emerges from cross-Channel trade, etc. The mixing of the two societies would be a bonus, too. Henry can get inspired by Chartres Cathedral and Clermont-Ferrand massif, built out of volcanic rock XP Beautiful structures.
The Treaty of Troyes in 1420 disinherited the Dauphin and made Henry V the acknowledged heir to the French throne. He married Catherine de Valois, the Kings daughter.One problem with a surviving Henry V; when Henry died, the English war effort didn't stop. John of Bedford was a fairly decent general who pushed south, right? The problem was the English got bogged down in the Loire valley, and the Burgundians had no desire to see the English win. What changes if Henry lives?
The Treaty of Troyes in 1420 disinherited the Dauphin and made Henry V the acknowledged heir to the French throne. He married Catherine de Valois, the Kings daughter.
The Dauphin contested the claim of the infant Henry VI. He would not have been able to contest the claim of Henry V. The Regents might have been capable, but they weren't Henry.And his child with Catherine was Henry VI in OTL, who had capable regents. I'm not sure I follow your point here.
Remember, Henry would be the lawful king. Agincourt aside, Henry had a grasp of strategy. He realized that the old method of raid and chevauche didn't work. Henry was starting at the channel and moving south, taking every fortification on the way. He got the King of France to acknowledge him as his heir.Henry would then have had to deal with a certain French peasant girl from Lorraine- & would he have had any more success than Bedford did? (Henry's millitrary reputation rests, to a great extent, on Agincourt, but without wishing to take anything away from what Henry did there, his victory is also largely owing to French arrogance, stupidity, & downright incompetence)
Remember, Henry would be the lawful king. Agincourt aside, Henry had a grasp of strategy. He realized that the old method of raid and chevauche didn't work. Henry was starting at the channel and moving south, taking every fortification on the way. He got the King of France to acknowledge him as his heir.
It's much harder for him to do that against Henry V than against the infant son.So are you saying that Charles VII does NOT
claim to be King of France regardless?(Which IOTL he did- thus keeping French resistance alive- against the Treaty of Troyes) Or that he's even just butterflied away?
Remember, Henry would be the lawful king. Agincourt aside, Henry had a grasp of strategy. He realized that the old method of raid and chevauche didn't work. Henry was starting at the channel and moving south, taking every fortification on the way. He got the King of France to acknowledge him as his heir.
The Dauphin contested the claim of the infant Henry VI. He would not have been able to contest the claim of Henry V. The Regents might have been capable, but they weren't Henry.