Frederick I

noun

Frederick Barbarossa,1123?–90, king of Germany 1152–90; king of Italy 1152–90: emperor of the Holy Roman Empire 1152–90.
1194–1250, king of Sicily 1198–1212: as Frederick II, king of Germany and emperor of the Holy Roman Empire 1215–50.
1657–1713, king of Prussia 1701–13 (son of Frederick William the Great Elector).

British Dictionary definitions for frederick i

Frederick I
/ (ˈfrɛdrɪk) /

noun

See Frederick Barbarossa
1657–1713, first king of Prussia (1701–13); son of Frederick William