Madrid’s Prado Museum has loaned a monumental 1653 Diego Velázquez painting to the Norton Simon Museum. At 14, Mariana married her uncle, Spain’s King Philip IV, then 44. The theatrical portrait has ...

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Philip IV was in trouble. Spain’s far-flung empire, arguably the world’s most powerful, had seriously wobbled in the 1640s — and so had the king’s family life. When the bloody Thirty Years' War that ...