As SWP said, the last saxon ruler was over half a century before.
People should be loyal to their own people first, then the civilians of the world and their monarchy after that (if they have one). Otherwise your leaving yourself open to being loyal to a tyrant/general cnut which is something we as a society look down upon; that doesn't stop some applying that selectively though.
That doesn't include supporting your own people going on the offence outside of lands they have a substantial claim on.