Equestrian statue of Philip IV in the Plaza de Oriente, Madrid.
Philip IV (Felipe IV), (8 April 1605 – 17 September 1665) was King of Spain from 1621 to 1665, sovereign of the Spanish Netherlands and also King of Portugal (as Philip III) until 1640. The eldest son of Philip III and his wife Margarita of Austria, Philip IV was born at Valladolid. He was known as the Planet King, after the Sun, the fourth planet in the astronomy of the time. By Brian Tansey.