Can you capture enemy spellbooks?
I doubt you could do this for balance reasons, but I'm still curious:
When you either kill an enemy sovereign or take their capital city, can you capture their spellbooks?
I kind of hope at the very least, the rare spellbooks only found in the game (not selectable at the beginning) do not just vanish from the game if their original owner is removed from the game?
On a related note, I've heard the sovereigns usually "escape" when killed (unless they have the "stubborn" disadvantage) - is there any way to prevent their escape?