How about an explanation/backgrounder of the royals' official and/or complete titles? for example, Prince Felipe is widely known as the Prince of Asturias and that Prince Philippe is the Duke of Brabant. but what other titles do they hold? and what is the history behind these titles? anything else special about these titles? i think that would be very informative and helpful.
they don't have to be limited to current or reigning monarchs; they can also include the famous or peculiar ones from history.