As far as I know he came into being as a Prince. The first time I remember seeing him is when our spy was near Stockholm and the Danes had just been topped up with troops. A captain stack that came out of Stockholm got a noble added to it, and it was Stenkil (Say... 1352?).

I'm happy to run around him and go smash Stockholm, but it seems rather silly for him to just sit there. Maybe I can tempt him out with some militia troops.