Prince Jean, Duke of Guise Prince Jean, Duke of Guise Prince Jean of Orléans, Duke of Guise (Jean Pierre Clément Marie; 4 September 1874 – 25 August 1940), was the son of Prince Robert, Duke of Chartres (1840–1910), grandson of Prince Ferdinand Philippe and great-grandson of Louis Philippe I, King of the French. His mother was Françoise of Orléans, daughter of François, Prince of Joinville, and Princess Francisca of Brazil. Upon the death of his cousin and brother-in-law Philippe, Duke of Orléans, claimant to the throne of France as "Philip VIII", the Duke of Guise became, at least for his Orleanist and Unionist supporters, titular
Prince Philip, Duke of Edinburgh on Sino-British relations, but it shaped his own reputation. Philip has held a number of titles throughout his life. Originally holding the title and style of a prince of Greece and Denmark, Philip abandoned these royal titles prior to his marriage, and was thereafter created a British duke, among other noble titles. The Queen formally issued letters patent in 1957 making Philip a British prince. When addressing the Duke of Edinburgh, as with any male member of the royal family except the monarch, the rules of etiquette are to address him the first time as "Your Royal Highness", and thereafter