Alfonso VI of León was a significant king in medieval Spain, ruling from 1065 to 1109. He is best known for uniting the kingdoms of León and Castile, which helped to strengthen the Christian presence in the Iberian Peninsula during the Reconquista. His reign marked a period of cultural and political growth, as he encouraged the arts and supported the development of cities. Alfonso VI was also known for his military campaigns against the Moors, aiming to reclaim territory for Christianity. His leadership and vision made him a pivotal figure in the history of Spain, influencing future generations of rulers and shaping the region's identity.