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 sisters were Margarita, Theodora, Cecilie, and Sophie. He was baptised into the Greek Orthodox Church. His godparents were his paternal grandmother Queen Olga of Greece and Alexandros S. Kokotos, Mayor of Corfu. Shortly after Philip's birth, his maternal grandfather, Prince Louis of Battenberg, then known as Louis Mountbatten, Marquess of Milford Haven, died in London. Louis was a naturalised British citizen, who, after a career in the Royal Navy, had renounced his German titles and adopted the surname Mountbatten, an Anglicized version of Battenberg, during the First World War due to Anti-German sentiment in Great Britain. After visiting London for