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Frederick I, (born c. 1123—died June 10, 1190), duke of Swabia (as Frederick III, 1147–90) and German king and Holy Roman emperor (1152–90), who challenged papal authority and sought to establish German predominance in western Europe.

Fast Facts: Frederick I (Barbarossa) Known For: Holy Roman Emperor and Warrior King Also Known As: Frederick Hohenstaufen, Frederick Barbarossa, Emperor Frederick I of the Holy Roman Empire Born: Exact date unknown; circa 1123, birthplace thought to be Swabia

Frederick I, German Friedrich known as Frederick Barbarossa (“Redbeard”), (born c. 1123—died June 10, 1190, Kingdom of Armenia), Duke of Swabia (1147–90), German king (1152–90), and Holy Roman Emperor (1155–90). He signed the Treaty of Constance (1153), which promised him the imperial crown in return for his allegiance to the papacy.

Frederick I. Frederick I - German King, Emperor, Barbarossa: Frederick Barbarossa had attempted to continue the imperial policy of the rulers of the Saxon and Salian lines. His state was still founded upon the noble, the high noble, and above all the newly founded rank of the imperial servants.

Frederick I (Frederick Barbarossa) The reign of Conrad’s successor and nephew, the duke of Swabia, Frederick I (1152–90), brought a major reassertion of imperial rule in Italy. Frederick saw himself not as the heir to a compromise but as a restorer of the Romano-Carolingian heritage of the German monarchy.

FREDERICK I (PRUSSIA) (1657 – 1713; ruled 1688 – 1713), as Frederick III elector of Brandenburg and duke of Prussia; from 1701, as Frederick I, king in Prussia. Frederick I was one of the great Hohenzollern rulers who contributed to the rise of the Prussian state.

FREDERICK I BARBAROSSA, ROMAN EMPEROR. Reign: March 4, 1152, to June 10, 1190; b.1122 or 1123, the son of Frederick II, Duke of Swabia, and Judith, the daughter of Henry the Black. His reddish-blond hair earned him the sobriquet "Barbarossa," which means "Red Beard" in Italian.

In the year 1152, Frederick Barbarossa was crowned King of Germany. Today people know Frederick Barbarossa as a powerful soldier, who tried to conquer Jerusalem and return it to the Christians. He was born in 1122 in a monastery in Altdorf , which is now called Weingarten.