Louis Alphonse, Duke of Anjou
Their father has conferred upon them the historic French titles of, respectively, Duke of Burgundy ("duc de Bourgogne"), and Duke of Berry ("duc de Berry"). (In Spain, the twins are "Don" Luis and "Don" Alfonso de Borbón Vargas). Prince Louis, as Legitimist Dauphin of France, is expected to succeed his father as head of the French royal house, the senior Bourbon/Capetian line, in Legitimist reckoning. However, under Spanish law, and assuming Felipe VI does not in future father a son, the Spanish crown will be inherited by his elder daughter Leonor, Princess of Asturias, who will become queen regnant, and if Felipe does have a son, that son will inherit the Spanish throne regardless of the genealogical seniority of the Anjou branch. Louis and Alphonse were baptised on 5 September 2010 at St Peter's Basilica in Vatican City. Louis' godparents were Arancha Martínez-Bordíu and Francisco D'Agostino and Alphonse's were Amparo Corell de Trenor, and Lorenzo Perales.
House of Stuart
The Royal House of Stuart became extinct with the death of Cardinal Henry Benedict Stuart, brother of Charles Edward Stuart, in 1807. Duke Francis of Bavaria is the current senior heir. However, Charles II had a number of illegitimate sons whose surviving descendants in the male line include Charles Gordon-Lennox, 11th Duke of Richmond; Henry FitzRoy, 12th Duke of Grafton; Murray Beauclerk, 14th Duke of St Albans; and Richard Scott, 10th Duke of Buccleuch. In addition, James II's illegitimate son, James FitzJames, 1st Duke of Berwick, founded the House of FitzJames comprising two branches, one in France and one in Spain. The last of the French branch died in 1967; the senior heir of James II's male line descendants is Jacobo Hernando Fitz-James Stuart, 16th Duke of Peñaranda de Duero.