Sancho III of Navarre, also known as Sancho the Great, was a prominent king who ruled from 1004 to 1035. He significantly expanded the territory of the Kingdom of Navarre through military conquests and strategic marriages, uniting various regions in the Iberian Peninsula. His reign marked a period of political stability and cultural development. Sancho III was known for his diplomatic skills and ability to navigate the complex relationships among the Christian and Muslim kingdoms of the time. He played a crucial role in the early formation of Spain and is remembered for his contributions to the Reconquista, the effort to reclaim territory from Muslim rule.