WI: Edward Longshanks assassinated in June 1272?

IOTL, Edward Longshanks, the future King Edward I of England, was attacked by an assassin. Edward killed the assassin, but was struck in the arm by a dagger, which was feared to be poisoned. What if the assassin had aimed a little higher and managed to wound Edward in the neck, or the blade had been poisoned and Edward lingers before dying in the Holy Land?

The next in line for the throne would by Edward and Eleanor of Castile's son, Henry. Although news of Edward's death would probably take some time to reach England. Assuming Henry IV* still falls ill and dies in 1274, would the next in line have been his sister, Eleanor (https://en.wikipedia.org/wiki/Eleanor_of_England,_Countess_of_Bar), or his uncle, Edmund Crouchback?

What other wider consequences would have occurred? Wales may continue to be independent and a thorn in England's side.

Any thoughts?
 
What were travel times like? Would news of Edward's death reach England prior to Henry III's death in November? If so, he could modify his will to fit the new circumstances (would that include expressly including/excluding his granddaughter in the succession?).

Otherwise, Empress Matilda is only a century and a half-ago, and Eleanor has further handicaps- she's only a kid, unmarried and after the death of 2 kings and an heir apparent in a 3-year period people might want the stability of a King Edmund.

Much would depend on how Edmund himself feels about things- he was loyal to his brother IOTL, but a niece could be a different matter.

Eleanor of Castile was a formidable woman though, so that should factor in.

Edmund of Cornwall (son of Richard of Cornwall, alleged Holy Roman Emperor) also has a role to play.
 
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