To many intellectuals, the coronation of William was associated with the restoration of the Holy Roman Empire. Felix Dahn wrote a poem, ""Macte senex Imperator"" (Hail thee, old emperor) in which he nicknamed William "Barbablanca" (whitebeard), a play on the name of the medieval emperor Frederick "Barbarossa" (redbeard). According to the King asleep in mountain legend, Barbarossa slept under the Kyffhäuser mountain until Germany had need of him. William I was thus portrayed as a second coming of Barbarossa. The Kyffhäuser Monument portrays both emperors.