From the time of Weimar Classicism in the late 18th century, even more in the Romantic era, the picturesque castle ruins became a popular destination for writers such as Johann Wolfgang von Goethe, who wandered in the Kyffhäuser range together with Duke Karl August of Saxe-Weimar in 1776. The legend of Frederick Barbarossa asleep in the mountain, perpetuated by Friedrich Rückert in an 1817 poem, became a symbol of rising German nationalism, illustrated by regular meetings of Burschenschaft fraternities and finally by the erection of the Kyffhäuser Monument from 1890 onwards. In 1900 the Kyffhäuserbund veterans' and reservists' association took its name from the historic site.