Friedrich I, also known as Frederick Barbarossa, was a Holy Roman Emperor who reigned from 1155 until his death in 1190. He is remembered for his efforts to consolidate the empire and strengthen its authority over the German states. His reign was marked by military campaigns in Italy and conflicts with the papacy, as he sought to assert imperial power. Barbarossa was a key figure in the Crusades, participating in the Third Crusade aimed at reclaiming Jerusalem. His leadership and ambition made him a legendary figure in medieval history, and he is often depicted in folklore and literature as a symbol of German unity and strength.