Northern Star - Legend of the north

Bjorn is a cheif in the North. He does not like to pushy men of the church that want him to join. He also have a son called Erik. That is a young boy.
Olav of Norway comes home from his travels and his mission is to make all the north christian. He starts buy killing the cheifs that has not yet gone over to the christian beleif. Olav kills Bjorn. Erik sees the murder and makes it his mition to get revenge.