King Afonso III was the King of Portugal from 1248 to 1279. He is known for completing the conquest of the Algarve, which expanded the kingdom's territory significantly. His reign marked a period of consolidation and growth for the Portuguese monarchy, as he worked to strengthen royal authority and improve the administration of his lands. Afonso III was also notable for his efforts in promoting trade and economic development. He established important relationships with other kingdoms, including Castile and Aragon, which helped to enhance Portugal's influence in the region. His reign laid the groundwork for future advancements in Portuguese history.