King Alfonso VII of León was a significant medieval ruler who reigned from 1126 to 1157. He was the first king 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 in the regions of León, Castile, and Galicia. Alfonso VII was known for his administrative reforms and support of the church, which helped strengthen his authority. He also promoted the growth of cities and trade, contributing to the economic development of his kingdom. His legacy includes the establishment of a more centralized government and the encouragement of cultural exchanges between Christians and Muslims.