I just became a wiki member a few minutes ago and am probably committing all sorts of errors, but want to be helpful if possible.
Between 800-855 a.d. the Norse settled in Denmark. By 855 a.d. there was a king. Being the restlesss type they migrated westerly to the Normandy area of France, and came to rule all of that area under a deal with the king in Paris.
This migration must have contained Norse. Swedes, Danes, and others, and it traversed the Netherlands. Out of all of it we got the Beaumont family ruling Normandy. The Beaumont family history of 339 pages is freely downloadable on the internet, and the first 15-20 pages covers the migration. All the foregoing is offered with the hope that it will, in some manner, benefit your project.
Fred A. Fairbanks