Sancho IV of Castile, also known as Sancho IV the Brave, was a king who ruled from 1284 to 1295. He was born in 1258 and was the son of Alfonso X of Castile. Sancho IV is known for his efforts to strengthen the monarchy and expand the territory of Castile during his reign. His rule was marked by conflicts with the Kingdom of Aragon and internal struggles among the nobility. Sancho IV successfully captured several key cities, including Seville, and worked to consolidate royal power. He died in 1295, leaving a legacy of military and political achievements.