"In diet he [Philipp IV.] was most regular and abstemious; he took but a small quantity of food, and seldom varied its quality. Though ruling over the land of Sherry, Malaga, Val de Peñas and Paxarete, he altogether excluded wine from his table, and in place of it, he used cinnamon water, of which he drank twice in the course of his repast. He usually eat alone, and apart from his queen and family; but attended by his physician, and by his gentlemen of the chamber, who were all grandees of Spain. His extreme punctuality in all arrangements for the disposal of his time, and the precision with which their respective duties were allotted to each of his domestics, rendered his service light. But, with all this household regularity, he was extremely improvident, and spent his revenues without consideration [für die Jagd, die Theateraufführungen, Bankette, Feuerwerke].... King Philip was always elegantly attired, and on solemn public days he appeared loaded with gems, and usually arrayed in the splendid garb of the order of the Golden Fleece. This personal decoration formed part of his great study, to maintain his royal dignity, of which he was peculiarly jealous. In prosecution of this plan, he also invariably preserved an assumed and sustained gravity. Every movement, when he did move, was regulated with a view to appear dignified and venerable. So afraid was he of diminishing the respect of his subjects, by condescension or familiarity, that he seldom spoke to the gentlemen of his chamber, who attended him at his meals, though they were all grandees of Spain. He generally made his wishes be comprehended by signs, and he has been known to pass a whole week without once opening his lips. ... Though thus abstemious in diet, and grave in demeanour, Philip was much addicted to promiscuous gallantry. He is said to have had at least thirty-two children, not entitled to bear the name of Infante, all of whom entered into religious orders, or were maintained as private individuals, with exception of Don John of Austria [Don Juan José de Austria]. ... In person Philip was of lofty stature, and his presence was majestic. His features, except the Austrian lip which he had inherited, were small and delicate, and his complexion fair and florid. Cespedes, a historian who wrote in the commencement of the reign of Philip, and describes him as he was in youth, says, that he had a fair silvery skin, blue eyes, a commanding brow, a bland and propitious aspect, a voice agreeable and sonorous. ... Like that of his father, it [sein Charakter] was mild and pacific, and betokened a temper gentle and clement, and a mind which, though it might possess sufficient fortitude to endure, was destitute of talents to contrive, or resolution to execute." (in: John Dunlop: Memoirs of Spain – During the reign of Philip IV. and Charles II. From 1621 to 1700, Vol 1, id., pp. 651-655).
Sein wohl ältestes uneheliches Kind war ein gewisser Francisco Fernando de Austria, der im Haus seiner Großeltern, bei denen es sich um vornehme Leute handelte, am 15. Mai 1626 zwischen 23 und 24 Uhr das Licht der Welt erblickte und der kurz vor dem 17. März 1634 starb. Er war also nur sieben Jahre alt geworden.