John IV, also known as John IV of Portugal, was born on March 15, 1604, and became King of Portugal in 1640. He is best known for restoring Portuguese independence from Spain after a 60-year period of rule. His reign marked the beginning of the Braganza dynasty, which continued to rule Portugal for over two centuries. During his rule, John 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 to stabilize the nation and laid the groundwork for future developments in the country.