Editor says, what if Harold Godwinson had marched to Hastings, dispatching the Normans first before heading North to fight the Norwegians at Stamford Bridge? Please note that the opinions expressed in this post do not necessarily reflect the views of the author(s).
Editor says, Source article - Jackie Speel writes: In our timeline last King of Saxon England, claimed the throne on the death of Edward the Confessor, defeated his own brother, Tostig Godwinson and Harald Hardrade, King of Norway at the Battle of Stamford Bridge, and then was killed in the Battle of Hastings, against William Duke of Normandy who became William I of England.
Harold II goes for Duke William first, and the latter is killed or routed (with consequent impacts on Franco-Norman relationships): he is then killed in the battle in the North.
If Tostig alone survived, he would probably succeed to the throne.
If Harald survived he would have united the two realms (and possibly divided them up again much as William I in OTL divided Normandy and England between his sons).
The battles would occur at different locations to OTL.
Harold alone survives both battles. His position would be secure for the immediate future.
In both Harold II and Tostig on the throne timelines, Edgar the &Aelig;theling, a more direct heir to the throne, but a youth in 1066, would probably have staged an attempt on the throne (much as he was involved in rebellion in OTL).
All four of Harold, William, Tostig and Hardrada die variously: Edgar (the) Aetheling succeeds to the throne. Editorial comments are entered in [light green] typeface.