While fairly familiar with how the Brits handled royal / noble titles and styles, the French handling is a mystery to me....perhaps someone could enlighten me?
By the end of the Ancien Regime, I believe the head of the House of Orleans no longer held the style Royal Highness because he was too far removed in descent from a reigning monarch? But as First Prince du Sang, however, he was styled as Monsr. The Duc d'Orleans, correct? What style did other members of the family hold? Highness? Serene Highness? When the future King Louis-Philippe was born, for example, what was his full title and style?
Also, I'm used to the British system where a Royal Prince is "elevated" as a Duke upon adulthood or marriage, and his heir (and heir's heir) use subsidiary titles in descending order of rank. What is the French system? It seems that sons are given titles in no particular order - a 2nd son might be a Count, a 3rd son a Duke, etc.
Example, why is Count of Paris used as the principal title of the head of the house instead of Duke of Orleans? The incumbent Henri, for example, is styled Count of Paris and also uses the title Duke of France. Henri's brother Jacques (the 8th child of the late Henri, Count of Paris) actually holds the title Duke of Orleans, while his elder brother Michel is merely a Count (of Evreux)?
Can anyone help me understand this?