Philip IV (1605–1665) was King of Spain from 1621 until his death, and also King of Portugal from 1621 to 1640. He was a member of the House of Habsburg and the eldest son of Philip III. Much of Philip IV's reign was dominated by the Thirty Years' War, and despite some successes his legacy is characterized by political and military adversity and the ongoing 17th-century decline of Spain as a great power. He is also remembered for his patronage of the arts. This oil-on-canvas portrait of Philip was created by the Spanish Golden Age painter Diego Velázquez, who was the leading artist in the king's court. The work is now in the Frick Collection in New York.Painting credit: Diego Velázquez