Louis Alphonse, Duke of Anjou
Louis Alphonse was born in Madrid, the second son of Alfonso de Borbón, Duke of Anjou and Cádiz, and of his wife María del Carmen Martínez-Bordiú y Franco, eldest granddaughter of Francisco Franco. Alfonso was at that time the dauphin (using "Duke of Bourbon" as title of pretence) according to those who supported the claim of his father, Infante Jaime, Duke of Segovia to the French throne. On 20 March 1975, the Infante Jaime ("Henri VI" by Legitimist reckoning) died. Alfonso then asserted his claim to be both Head of the House of Bourbon and Legitimist claimant to the throne of France and the Co-Principality of Andorra. As such, he took the title "Duke of Anjou", and on 19 September 1981 gave Louis Alphonse the title Duke of Touraine.
Fils de France
Although the children of monarchs are often referred to in English as "prince" or "princess", those terms were used as general descriptions for royalty in France but not as titular prefixes or direct forms of address for individuals (with the exception of "Monsieur le Prince" for the senior "prince du sang") prior to the July Monarchy (1830–1848). Collectively, the legitimate children of the kings and dauphins were known as "enfants de France" ("children of France"), while examples abound in reputable works of "fils de France" and "fille de France" being converted into other languages as "Prince/Princess of France" (however the same works, as cited, leave the Spanish equivalent, "Infante/Infanta de España)", untranslated. The illegitimate children of French kings, dauphins, and "princes du sang" were not entitled to any rights or styles "per se", but often they were legitimised by their fathers. Even then, however, they were never elevated to the rank of "fils de France", although they were sometimes accorded the lower rank and/or privileges associated with the "princes du sang".