Frederick I of Hohenstaufen, also known as Frederick Barbarossa, was a Holy Roman Emperor who reigned from 1155 to 1190. He was born in 1122 and became known for his efforts to consolidate the power of the empire and strengthen its authority over the Italian territories. Frederick sought to restore the glory of the Holy Roman Empire and was involved in numerous military campaigns, particularly in Italy. Frederick's reign was marked by conflicts with the Pope and various Italian city-states, as he aimed to assert imperial control. He was a key figure in the Crusades, participating in the Third Crusade, where he drowned in the Saleph River in 1190. His legacy includes the promotion of the Hohenstaufen dynasty and the influence he had on medieval European politics.