TS4 Royalty & Legacy Expansion Pack

A world is defined a Kingdom if someone residing the world joined the nobility career. There won't need to be a king.

When editing the career titles, you can select to add the same adjustments to all kingdoms. Note that they do not mean "all worlds", but all worlds where someone works in the nobility career. 

All nobles get the title + "of Windenburg" or "of San Myshuno" etc. I means it will look a bit weird if you have several sims on the same level in the same world, but with some imagination and a next promotion it should not be a big deal. In my game nobility is already settled, but they are pretty well spread. If I was to start over, I'd have max 2 noble families in each world, maybe 3 in the larger worlds.