Encyclopædia Britannica, Ninth Edition/Philip IV. of Spain

PHILIP IV. (1605–1665), king of Spain, son of Philip. III., was born at Valladolid on 8th April 1605, was married to Isabella of France on 25th November 1615, succeeded his father on 31st March 1621, and died on 17th September 1665. From 1621 to 1643 the well-known duke of Olivares held the reins of real power in the Peninsula; he was afterwards succeeded by the duke of Carpio. See Spain.