Here are the rules, nice and simple for you folks who don't like to go into detail

Draw anyone from a royal court

Examples:
King
Queen
Prince
Princess
Court Jester (the fool)
Servant/Maid
Curator (the person who takes all the notes)
etc etc

If you can think of anyone else, by all means go ahead. You can even combine characters and do whatever you want. Yaoi/yuri I don't give a care! Just color it and put a background.