Obviously its a work of fiction but having played assassins creed valhalla you get to see two different sides to the norse invaders. The obvious raiding and pillaging but also forming alliances and integrating with the local saxon communities.

As someone who lives in the east of England you can see even today the influence the vikings had, for example street names with the word "gate" and town/village ending in "by" or "thorpe" etc. Even our days of the week and based on norse mythology and how we celebrate christmas is heavily influenced by their yule celebrations. Surely they wouldn't have had such an influence if they were just raping and pillaging? Surely they had to integrate with the Saxons and share cultures with each other including many vikings converting to christianity (please correct me if this statement is wrong)