João IV was the King of Portugal from 1640 until his death in 1656. He is best known for restoring Portuguese independence from Spain after a 60-year period of dynastic union. His reign marked the beginning of the Braganza dynasty, which ruled Portugal for over two centuries. During his rule, João IV focused on strengthening the economy and military of Portugal. He also supported the arts and culture, leading to a flourishing of Portuguese literature and music. His leadership helped stabilize the nation and laid the groundwork for future developments in the country.