WI "Southampton Plot" was successfull in 1415 and Henry V dies??

The Southampton Plot of 1415 was a conspiracy against King Henry V of England, aimed at replacing him with Edmund Mortimer 5th Lord of March. The three ringleaders were Richard de Conisburgh 3rd Earl of Cambridge, Mortimer's brother-in-law, Henry Scrope 3rd Baron Scrope of Masham (whose uncle Richard le Scrope had been executed for his part in the 1405 revolt), and Sir Thomas Grey. They were charged with plotting to murder Henry at Southampton before his embarkation into France; revolts in favour of Mortimer by Lollards under Sir John Oldcastle in the West Country, and by the Percies in the North, would follow.
The plot was disclosed to its nominal principal, the Earl of March, shortly before it was to take effect. However, he promptly informed King Henry (on July 31), and the three ringleaders were promptly arrested and put to death...
WI Edmund Mortimer kept his mouth shut and Henry V was assassinated in 1415? Could he become Edmund I of England and secure his crown? How would the Dukes of Clarence, Bedford and Gloucester react to the assassination of their brother? How is this death affects History? Any thoughts?
 
He would be Edmund I, yes, as the latest king of the restored Plantagenet dynasty. Henry's brothers would react badly, obviously, as they were generally very loyal to their brother. John would declare himself John II as Henry's heir presumptive, so the Plantagenet faction would probably try to have Henry's brothers preemptively arrested. Depending on how many nobles opposed March and how many sat on the fence or joined him, there might be a brief civil war. Other than that I can't sat much.
 
He would be Edmund I, yes, as the latest king of the restored Plantagenet dynasty. Henry's brothers would react badly, obviously, as they were generally very loyal to their brother. John would declare himself John II as Henry's heir presumptive, so the Plantagenet faction would probably try to have Henry's brothers preemptively arrested. Depending on how many nobles opposed March and how many sat on the fence or joined him, there might be a brief civil war. Other than that I can't sat much.

An early War of the Roses would erupt i guess between the House of Lancaster and the House of Mortimer... But i agree that victory would depend on how many nobles were dissatisfied by Henry IV and Henry V and side up with Edmund I...
 
The main problem for the House of Lancaster would be that Henry's brothers were childless and their dynasty faced extinct in the male line... if this happens succesion would evolve to Rupert son of Blanche Electress Palatine... If he dies unmarried as per OTL then the House of Lancaster faces a severe succession crisis and the Lancaster claim falls upon Infante Duarte future King of Portugal and son of Henry's IV sister Philippa of Lancaster... And surely the Beauforts would emerge to claim something from the Crown...
 
The main problem for the House of Lancaster would be that Henry's brothers were childless and their dynasty faced extinct in the male line... if this happens succesion would evolve to Rupert son of Blanche Electress Palatine... If he dies unmarried as per OTL then the House of Lancaster faces a severe succession crisis and the Lancaster claim falls upon Infante Duarte future King of Portugal and son of Henry's IV sister Philippa of Lancaster... And surely the Beauforts would emerge to claim something from the Crown...

The English didn't involve the foreign Lancaster claimants in their civil war, and the Beauforts took over the Lancaster claim. The Beaufort-claim was Henry VII Tudor's blood-claim to the throne.

What was the Mortimers' relation to the Yorkists?
 
The English didn't involve the foreign Lancaster claimants in their civil war, and the Beauforts took over the Lancaster claim. The Beaufort-claim was Henry VII Tudor's blood-claim to the throne.

What was the Mortimers' relation to the Yorkists?

Edmund's sister Anne was married to Richard 3rd Earl of Cambridge son of Edmund of Langley 1st Duke of York and was the mother of Isabel Plantagenet and Richard 3rd Duke of York...
 
But with Henry V dead and a dynastic crisis going on in England (and the threat of civil war quite apparent) the invasion of France would be butterflied away... Giving them enough time to reorganise and deal with the English if they decided to press their claims on French Crown later...
 
But with Henry V dead and a dynastic crisis going on in England (and the threat of civil war quite apparent) the invasion of France would be butterflied away... Giving them enough time to reorganise and deal with the English if they decided to press their claims on French Crown later...

You say that, but there were plenty of breaks in the fighting. There hadn't been a proper invasion of France for a few decades at this point. What made Henry so successful was not that the French weren't prepared - the size of their army shows they thought they were prepared. What made him so successful was the fact that the French used outdated tactics whereas Henry used his army's strengths perfectly, and the ground of Agincourt suited the English to a tee. These are not things that time out of combat will solve. Giving the French longer to prepare may actually have the opposite effect, with natural divisions between the bickering French nobles giving chance for the French to be cut in two politically, weakening their ability to fight, or making them not expect an English attack, or lose the experience that the older nobles had of combat, thus making them worse soldiers in the field. But arguably the biggest deciders in how well the English would do in an ATL are the ground the battle(s) is fought on, and the men commanding the army. History has shown us that both the English and the French can outmuscle each other, and that both had the ability to come back from a "hopeless" position.
 
With Henry V dead and England sunk into into civil war there is no invasion of France... But things in France werent better either... Charles VI was already mad and the Kingdom unstable from the conspiracies of his wife Isabeau de Baviere... The only good thing for France is that since there would be no invasion of France and no Agincourt so Louis le Dauphin lives long enough to succeed his infirm father or become his regent and face English aggression when the dynastic crisis is over in England....
 
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