Afonso IV of Portugal, also known as Afonso IV the Brave, was the King of Portugal from 1325 until his death in 1357. He was the son of Afonso III of Portugal and Beatrice of Castile. His reign was marked by conflicts with neighboring kingdoms and efforts to strengthen the Portuguese monarchy. Afonso IV is best known for his military campaigns against Castile and for supporting the Portuguese nobility. He also played a significant role in the early stages of the Portuguese Age of Exploration, laying the groundwork for future maritime endeavors. His legacy includes a focus on consolidating royal power and territorial expansion.