Why don't you extend the map to Russia?

[Hamlet1]

I mean the story of Rurik and his sons. This will add Sweden and Finland along with Northern Russia and Lithuania.  New Cultures and religions. Slavs, Finnish etc.

 

[Sarkiss]

Russians are making a film called "the Viking", probably about Rurik.

trailer looks pretty solid: https://www.youtube.com/watch?v=ny9Fmx-rUKQ

 

[Lemble]

I believe you can mod now

 

[Ivan Khan]

It would be a neat mod. Sweden down to the Mediterranean as the map. Loads of rivers.