I don't have my 2nd ed. book to hand, just the 3.0/3.5 conversion.

I may have this wrong, but wasn't it possible for someone slaying a regent to inherit not only their bloodline, but their realm, too? Provinces and all? I'm looking, but not seeing, anything like that in the 3e BRCS, only bloodline usurpation.

Can someone point this out to me?

My (Pathfinder Kingmaker) campaign is nearing a point where a rival ruler is about to go down, and I'd like to have my rules fixed in my head before I go and make silly rulings.