King Afonso IV was the King of Portugal from 1325 until his death in 1357. He was the son of King Afonso III and Beatrice of Castile. Afonso IV is known for his efforts to strengthen the Portuguese monarchy and expand its territories, particularly through military campaigns against Castile. During his reign, Afonso IV faced challenges, including conflicts with the Castilian crown and internal disputes among the nobility. He is also remembered for his support of the Portuguese economy and culture, which laid the groundwork for future developments in the kingdom.