Breton "Normans" in France

[Hvalrossen]

The viking did attack and influence Brittany though, it's not unlikely.

Brittany being conquered by Norse Vikings, who establish themself similar to the Normans of Normandy is not unrealistic i agree. What is less certain is their conquest of France.

 

[Hvalrossen]

The viking did attack and influence Brittany though, it's not unlikely.

Maybe instead of moving primarily to Normandy, most of the Norse settlers are settled in Brittany?

 

[Intosh]

Have France (mostly West Francia) be conquered by Breton speakers, who replace the French speaking nobility with a Breton speaking nobility.

Conquering all West Francia is too much but a more successfull migration to Western France is possible.

The result will be a "Big Britanny" than include historical Britanny + historical Normandy and a little of Picardy in the north and a little more lands to the south east including today Maine, Anjou, Touraine on the banks of the Loire river.