Prince or Princess of Asturias (, ) under the Spanish Constitution of 1978, is the historical and official title given to the heir to the Spanish throne. It was also the title under the earlier Crown of Castile. The current heir to the Spanish throne, therefore Princess of Asturias is Leonor, Princess of Asturias, daughter of King Felipe VI and Queen Letizia of Spain. Other associated titles originate from some of the other kingdoms that formed Spain: Prince of Viana (for Navarre), Prince of Girona (for Aragon), Duke of Montblanc (for Catalonia), Count of Cervera (for Valencia) and Lord of Balaguer (for Majorca).