As a Danish person, it's really interesting to see how united we already were at this point compared to Norway and Sweden. Just three cities (Jelling, Ribe, Roskilde), and you have most of the country covered. And this is about a century before the time of Gorm the Old, so unification was fairly close in historical terms.
Norway would be unified almost a quarter of a century later. It's funny because I'd normally never need to spend so much time on the Scandinavian borders when making maps like this, especially because the borders haven't really changed that drastically.
2. Yes, it is Northumbria. However, I have added Northumberland.
Please do some historical research first before you run your mouth.
Please accept also Lotharingia (maybe also Lothringia) for Middle Francia.