Emperor Frederick Barbarossa, born in 1122, was a significant ruler of the Holy Roman Empire from 1155 until his death in 1190. He is known for his efforts to consolidate imperial power and strengthen the empire's influence in Italy. His reign was marked by conflicts with the Pope and various Italian city-states, as he sought to assert control over the region. Barbarossa was also a key figure in the Third Crusade, which aimed to reclaim Jerusalem from Muslim control. His leadership and military campaigns left a lasting impact on the political landscape of Europe during the Middle Ages.