Alfonso VII was a significant medieval king of Castile and Leon, ruling from 1126 to 1157. He was the first monarch to use the title "Emperor of All Spain," reflecting his ambition to unite the various Christian kingdoms in the Iberian Peninsula. His reign was marked by military campaigns against Muslim territories and efforts to consolidate power. Alfonso VII was known for his administrative reforms and support of the Church, which helped strengthen his rule. He also promoted the growth of cities and trade, contributing to the economic development of his kingdoms. His legacy includes fostering a sense of unity among the Christian states.