The disadvantages of the Norse in 867 are:
Norse raiders can travel throughout the river system (mainly through Rus).With Raiding you are able to send an army over to any rival faction's land and raid their goods for some nice cash.Ylving's Östergötland resides in the De jure of Norway) Subjugation CB allows you to take over the kingdom that your primary title resides in (eg.So the advantages of the Norse in 867 are as follows: