King John IV of Portugal reigned from 1640 to 1656 and is known for restoring Portuguese independence from Spain. His ascension to the throne marked the end of the Iberian Union, which had lasted for 60 years. John IV was a member of the House of Braganza and is often remembered for his efforts to strengthen the Portuguese monarchy and promote national identity. During his reign, John IV faced challenges, including military conflicts with Spain and internal strife. He is also recognized for his patronage of the arts, particularly music and literature, which flourished during his time. His legacy includes the establishment of a more autonomous Portugal and the promotion of cultural achievements.