Son of Frederick William who in 1701 became the first king of Prussia (1657-1713).
2.
Holy Roman Emperor from 1152 to 1190; conceded supremacy to the pope; drowned leading the Third Crusade (1123-1190). Synonyms:Barbarossa, Frederick Barbarossa.
... the signing of the Concordat of Worms the emperor Frederick I, called Barbarossa from his red beard, succeeded to the throne. Frederick, the second emperor, of the Hohenstaufen dynasty [37] was capable, imaginative, and ambitious. He took Charlemagne and Otto the Great as his models and aspired like them ... — EARLY EUROPEAN HISTORY • HUTTON WEBSTER
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