What are the requirements for making a king title? In my current game I am Duke of Burgundy, part of France. I hold the Duchies of Gallilee, Tripoli, Antioch, Ascalon and Jerusalem and all but 3 provinces that are de jure part of the Kingdom of Jerusalem. Still I don't get the option to create or usurp the title. What am I missing? Do I need to be independent to create a King title?
Thanks for any insight.