WI: William the Conqueror is killed during the Harrying of the North?

What if, say, around 1069-1070, William the Conqeuror is killed during the Harrying of the North, or, to be more precise, around the time Edgar the Atheling and Sweyn II of Denmark invaded and captured York? How much of England could Edgar and Sweyn take/how much of England would rise up in Edgar's favour? I imagine most, if not all, the Norman/Breton/Frankish/Flemish nobles William brought with him would favour his eldest son, Robert Curthose, but there were still a few high-ranking Anglo-Saxon nobles, like Hereward the Wake and the brothers Edwin and Morcar.

If Edgar succeeds, I could see him marrying a daughter of either Sweyn II, Harold Godwinson or even Philip I of France's sister, Emma (IOTL, Philip I invited Edgar to France in 1074, offering him land near the Norman border so he could harass William's lands), though I admit the first seems more likely. Or perhaps Sweyn might have considered seizing the throne for himself via his relation to Canute the Great.

Any thoughts?
 
Well, simply put, the clusterfuck that is the English succession continues, because it will be a three way fight between Sweyn II (who just like in the original conflict, would still be in the weakest position amongst the three), Robert Curthose (now Robert I of England and II/III of Normandy) who now rules the South, including the English capital of Westminster and now Edgar the Atheling, who controls North England and could cement support with the Prince of Gwynedd (Bleddyn ap Cynfyn), and the Kings of both Scotland (Malcolm III) and France (Henri I).

I could see Edgar marrying a daughter of one these three, but it's highly unlikely any of Harold's daughters would be available, Gunhild is implied to have married to Alan Rufus, while Gytha was in the court of Sweyn II at the time, plus both of them are viewed as illegitimate by the Catholic Church. Sweyn, considering he was making good on his claim to the throne at the time, probably would go up against both, so a marriage of such would be unlikely.

On the flip side, it could make Edith of Scotland (and OTL's wife of Henry I of England) suddenly available.
 
Well, simply put, the clusterfuck that is the English succession continues, because it will be a three way fight between Sweyn II (who just like in the original conflict, would still be in the weakest position amongst the three), Robert Curthose (now Robert I of England and II/III of Normandy) who now rules the South, including the English capital of Westminster and now Edgar the Atheling, who controls North England and could cement support with the Prince of Gwynedd (Bleddyn ap Cynfyn), and the Kings of both Scotland (Malcolm III) and France (Henri I).

I could see Edgar marrying a daughter of one these three, but it's highly unlikely any of Harold's daughters would be available, Gunhild is implied to have married to Alan Rufus, while Gytha was in the court of Sweyn II at the time, plus both of them are viewed as illegitimate by the Catholic Church. Sweyn, considering he was making good on his claim to the throne at the time, probably would go up against both, so a marriage of such would be unlikely.

Emma of France it is then, I suppose.

On the flip side, it could make Edith of Scotland (and OTL's wife of Henry I of England) suddenly available.

Edgar's niece?
 
...So it's agreed, let's not go with Malcolm's daughters then.

Agreed. As for Normandy, if we're going by legitimacy, the closest "legitimate" claimant to William's father, Robert the Magnificent, would be William, Count of Burgundy (https://en.wikipedia.org/wiki/William_I,_Count_of_Burgundy). Though I'm not sure if he would want to claim the Duchy, along with the hassle of being vassal to the Holy Roman Emperor and/or the King of France.
 
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