Philip IV was the King of Spain from 1621 to 1665, known for his efforts to strengthen the Spanish monarchy during a challenging period. He faced numerous conflicts, including the Thirty Years' War, which strained the country's resources. Despite these challenges, Philip IV was a patron of the arts, supporting famous artists like Diego Velázquez. His reign saw the decline of Spanish power, as economic troubles and military defeats weakened the empire. The Peace of Westphalia in 1648 marked a significant turning point, as Spain lost influence in Europe. Philip IV's legacy is a mix of cultural achievements and political struggles.