Prince or Princess of Asturias is the main substantive title used by the heir apparent, heiress apparent or heir presumptive to the throne of Spain. According to the Spanish Constitution of 1978:Article 57 [...]
2. The heir apparent, heiress apparent or presumptive, from birth or event that makes him such, will have the dignity of Prince of Asturias and other titles traditionally linked to the successor of the Crown of Spain.
Imaginative portrait of King Henry III of Castile, by Calixto Ortega, 1848. He was the first Prince of Asturias, proclaimed in 1388.
Education of Prince John, by Salvador Martínez Cubells 1877. John was the only son of the Catholic Monarchs and heir of all their domains during his lifetime.
Cover of the first edition of the Political Constitution of the Spanish monarchy. Cádiz, 19 March 1812
Dauphin of France, originally Dauphin of Viennois, was the title given to the heir apparent to the throne of France from 1350 to 1791, and from 1824 to 1830. The word dauphin is French for dolphin and was the hereditary title of the ruler of the Dauphiné of Viennois. While early heirs were granted these lands to rule, eventually only the title was granted.
Image: Young Charles VI of France
Image: Charles, 6th Dauphin
Image: Louis de Guyenne, dauphin of France