Brittany and Normandy

[JHPier]

In the 9C Brittany was a fairly substantial kingdom that acquired the western third of modern Normandy from the failing Carolingians and stretched as far east as Angers in the south.
Then in 914(?) it was conquered by Vikings. The Bretons managed to throw these out again after 20 yrs or so but were forced to accept the overlordship of the kings of France and lost their acquisitions.

WI the Breton kings had somehow avoided being conquered by Vikings, but had retained all their territory and kept their barons in line?

Would William of Normandy still have conquered England in 1066?
And would the De Hautevilles (who hailed from western Normandy) still created the Norman kingdom in southern Italy?

 

[Smuz]

Wasn't William the Bastard son of one of said Viking kings? So him existing would be a little unlikely. Unless he's a viking prince in this timeline, invading Britain in a new wave of viking landings (As the head of the force lead in OTL by Harald Hadrada?)

 

[JHPier]

Wasn't William the Bastard son of one of said Viking kings? So him existing would be a little unlikely.

William was the descendant of Rollo who became count(?) of Rouen shortly after 900. William the Bastard would still exist (probably), but his duchy quite a bit smaller.