Frederick Barbarossa

noun
1.
Frederick I (def 1).

Frederick I

noun
1.
("Frederick Barbarossa") 1123?–90, king of Germany 1152–90; king of Italy 1152–90: emperor of the Holy Roman Empire 1152–90.
2.
1194–1250, king of Sicily 1198–1212: as Frederick II, king of Germany and emperor of the Holy Roman Empire 1215–50.
3.
1657–1713, king of Prussia 1701–13 (son of Frederick William the Great Elector).

Barbarossa

[bahr-buh-ros-uh] /ˌbɑr bəˈrɒs ə/
noun
1.
Frederick, Frederick I (def 1).
2.
the planning and operational code name the Germans gave to their invasion of the Soviet Union (June 22, 1941).
British Dictionary definitions for Frederick Barbarossa

Frederick Barbarossa

/ˌbɑːbəˈrɒsə/
noun
1.
official title Frederick I. ?1123–90, Holy Roman Emperor (1155–90), king of Germany (1152–90). His attempt to assert imperial rights in Italy ended in his defeat at Legnano (1176) and the independence of the Lombard cities (1183)

Barbarossa

/ˌbɑːbəˈrɒsə/
noun
1.
the nickname of the Holy Roman Emperor Frederick I See Frederick Barbarossa
2.
real name Khair ed-Din. c. 1465–1546, Turkish pirate and admiral: conquered Tunis for the Ottomans (1534)

Frederick I

/ˈfrɛdrɪk/
noun
1.
See Frederick Barbarossa
2.
1657–1713, first king of Prussia (1701–13); son of Frederick William