Afonso III was the King of Portugal from 1248 to 1279. He is known for completing the conquest of the Algarve, the southern region of Portugal, which was important for expanding the kingdom's territory. His reign helped to strengthen the monarchy and improve the country's economy through trade and agriculture. During his rule, Afonso III also focused on establishing a strong legal system and promoting the rights of his subjects. He was a patron of the arts and education, which contributed to the cultural development of Portugal. His efforts laid the groundwork for future advancements in the nation.