I don't understand what you're even trying to do here. A vassal holding a kingdom title as a viceroyalty is no less strong than the same vassal holding normally. And a few king-level vassals, even if relatively strong, are easier to manage than a bunch of dukes and counts. If you're an Emperor, you should want king-level vassals, granted that having them as viceroyalties instead of the titles being hereditary does have some advantages.Question, thanks for the help.
I am HRE, 769 start, going for the full game achievement. It's year 1046. I am Agnatic Cognatic Princely Elective. How do I keep kingdoms under my belt? I can't make them Princely Elective, I only have simple Elective. If I destroy them, my vassals create them, and I have too strong vassals.
Also, how can I give them as viceroyalties