Hmm found a noblewoman married to a lowborn. Thought it's always matrilineal, maybe it was due to the arrange marriage event.
My norse game with Halfdan Whiteshirt turned out to be pretty interesting. Starts off picking up Northumberland, next I pick on the Irish. Started thinking of joing Scotland or Denmark, and Scotland takes all my Irish holdings in one swoop. Joined Denmark, did lots of raiding, helped fend off an independence war, then I got fed up and joined the second one. Took the throne Scotland in about 10 years through invasion. Was worrying about what to do about Denmark when they decided to fight for my claim, mom was a danish princess. Denmark was gifted to me so I'm working on reforming norse faith.