[Arryn]

Originally posted by Zen:
The best way to stop an AI from casting on alot of undefended provinces is to go siege his capital. He'll throw everything he has for the most part at trying to free that.

Working on it. I finally located Pythium while I was munching on his border temples. As soon as I wipe Caelum out (a few more turns) I'll be able to devote my undivided attention to Pythium's home base.