The title is just an example. I was wondering, what determines when a person switches from a dynasty surname (ie, Valois) to their kingdom name (ie, France) in historical documents?
This already happened in CK1 with province names, should this also happen at the kingdom level as well? If so, what would make this change? Should the bastard child of a king be known this way? Should it be reserved for the 1st born? Should it be recorded in the AAR this way? Should this be another form of a 'title', such a William the Conqueror? Should this be reserved for the spouse of the ruler? (ie, King Henry IV Plantagenet marries Margaret of Aragon, or Queen Mary Tudor marries Philip of Spain)?
It's basically all just RPG aesthetics, not really necessary for gameplay reasons, but could be nice to have.