I know it isn't based on world standing because there are far more kings/queens than princes/princesses. It tells you how many points you need to level up, and how many you have, but what are the actual point prerequisitea for each of the rankings?
A very good question in my opinion. Coming back from a long hiatus, I wouldn't exactly know where to start looking but I don't think it's anywhere easy to find through my experience of looking around recently. Maybe you're just supposed to not know and see how long it takes you to get to the end as surprise? I'll try my best to find out for you.
