Diego, Prince of Asturias
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Diego, Prince of Asturias and Portugal was the fourth son of Philip II of Spain and his third son by his fourth wife, Anna of Austria.
Portrait of Prince Diego aged 2 by Sánchez Coello, c. 1577
The birth of Ferdinand, Prince of Asturias, Diego's elder brother
Prince of Asturias
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Prince or Princess of Asturias is the main substantive title used by the heir apparent, or heir presumptive to the Spanish Crown.
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