Re: bug and question
 

Try searching with Death magic in the disease province, I think that will locate the site. I don't remember it doing anything other than annoying you, but there might be a death gem associated with it.

Re: bug and question
 

Edi:

I had provinces owned by non-existing nations once.

And my pretender having heroic ability when I got to him through HoF.

Strange things sometimes happen http://forum.shrapnelgames.com/images/smilies/happy.gif