I thought that I should write.
Most probably you are related to the Vikings
in my comment.
I think it was a brutal periode. I saw a program on National Geographic why they suddenly disappeard. The reson as so often:
Danish and Norwegian Vikings started to fight each other.
My friend from Finland Aimo commented when I told that story.
Typical, brother start fighting brother and they are of equal strenght.
So never start fighting with your brother.
Never start fighting at all
Now it is Holland / Italy.