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.
Legitimists
Legitimists hold that the king of France must be according to the traditional rules of succession based on the Salic law. When the direct line of Charles X became extinct in 1883 with the death of his grandson Henri, Count of Chambord, the most senior heir to the throne under these traditional rules was Juan, Count of Montizón, a descendant of Louis XIV through his grandson Philip V of Spain. The fact that all French Legitimist claimants since 1883 have been members of the Spanish royal dynasty remains irrelevant to Legitimism, but it has prompted other French monarchists to pivot to support of the Orléans line.