Death of Frederick Barbarossa
What happened
Holy Roman Emperor Frederick I Barbarossa drowned on June 10, 1190, in the Saleph River (now Göksu River) in Anatolia while leading German forces on the Third Crusade. His death caused the disintegration of the German contingent and significantly weakened the crusade, contributing to its ultimate failure to recapture Jerusalem despite Richard I's military successes.
Literary impact
Barbarossa's mysterious death spawned legendary accounts in German literature, most notably his transformation into a sleeping emperor who would awaken to restore Germany's glory in times of need. This legend influenced later nationalist poetry and political mythology, appearing in works from medieval chronicles to 19th-century Romantic literature. The emperor's crusading reputation also featured in Minnesang poetry, where he was celebrated as an ideal Christian ruler and warrior.
Source: Wikipedia