His son Henry V inherited the quarrels and the castle was finally slighted by the Saxon Duke (and later Emperor) Lothair of Supplinburg in 1119. Lothair himself started the reconstruction in his later years and the Imperial Castle of Kyffhausen, one of the largest castle complexes in Germany, was completed under the Hohenstaufen emperor Frederick Barbarossa. Tilleda was last mentioned as an Imperial castle in 1194, when Frederick's son Henry VI reconciled here with the insurgent Welf duke Henry the Lion. In 1698 Count Albert Anton of Schwarzburg-Rudolstadt had a Baroque hunting lodge erected at the hamlet of Rathsfeld in the centre of the Kyffhäuser range. Last used as a residence by Prince Günther Victor of Schwarzburg after his abdication in 1918, it was turned into a recreation home of the Kyffhäuserbund veterans' association in 1925. After World War II the remote site became a Young Pioneer camp and a training camp of the East German Gesellschaft für Sport und Technik; since German reunification, the empty premises have decayed. Kyffhäuser legend According to a king asleep in mountain legend, Emperor Frederick Barbarossa, who actually drowned on 10 June 1190 in the Calycadnus River near Seleukeia in Asia Minor during the Third Crusade, is not in fact dead, but sleeps in a hidden chamber underneath the Kyffhäuser hills. He sits motionless at a stone table and his beard has supposedly grown so long over the centuries that it grew through the table. As in the similar legend of King Arthur, Barbarossa supposedly awaits Germany's hour of greatest need, when he will emerge once again from under the hill. The presence of ravens circling the Kyffhäuser summit is said to be a sign of Barbarossa's continuing presence. Similar rapture legends refer to Emperor Frederick II or to Charlemagne sleeping in the Untersberg near Salzburg. The Barbarossa myth was first documented in the late 17th century and later popularized by the Brothers Grimm and a poem written in 1817 by Friedrich Rückert. Frequently taken up by Romantic authors, and satirized in Germany. A Winter's Tale by Heinrich Heine, it became the expression of the desire for the Old Empire's re-emergence as a German nation state. When the Kyffhäuser Monument was built at the ruins of the Imperial Castle in 1890–1896, with a statue of Frederick Barbarossa and an Emperor William monument, the German Emperor William I was thought to have "laid to rest"