Answer
Abd al-Rahman III, the ruler of the Umayyad Emirate of Córdoba from 912 to 961, presided over the Umayyad Era. This period marked a golden age for the Iberian Peninsula, characterized by cultural, intellectual, and economic flourishing. He significantly expanded the territory under his control, patronized the arts and sciences, and enhanced infrastructure, cementing his legacy as one of the most influential figures in medieval Spain.