in the Kingdom of Hanover. Since Göttingen was a part of Hanover, the brothers were expected to take an oath of allegiance. However, the brothers and five other professors led a protest against this and were heavily supported by the student body since all of these professors were well renowned. Jacob left Göttingen immediately and Wilhelm followed him to Kassel a few months later. In Kassel, the Grimms devoted themselves to researching and studying. A close friend of theirs, Bettina von Arnim, was also a talented writer. Savigny and others convinced the King of Prussia, Friedrich Wilhelm IV, to allow the brothers to teach and conduct research at the University of Berlin. In March 1841, the brothers did just this and also continued to work on the German Dictionary. Influence Kinder- und Hausmärchen (Children and Household Tales) is listed by UNESCO in its Memory of the World Registry. The Grimms believed that the most natural and pure forms of culture were linguistic and based in history. The work of the Brothers Grimm influenced other collectors, both inspiring them to collect tales and leading them to similarly believe, in a spirit of romantic nationalism, that the fairy tales of a country were particularly representative of it, to the neglect of cross-cultural influence. Among those influenced were the Russian Alexander Afanasyev, the Norwegians Peter Christen Asbjørnsen and Jørgen Moe, the English Joseph Jacobs, and Jeremiah Curtin, an American who collected Irish tales. There was not always a pleased reaction to their collection. Joseph Jacobs was in part inspired by his complaint that English children did not read English fairy tales; in his own words, "What Perrault began, the Grimms completed". W. H. Auden praised the collection during World War II as one of the founding works of Western culture. The tales themselves have been put to many uses. Adolf Hitler praised them so strongly that the Allies of World War II warned against them, as Hitler thought they were folkish tales showing children with sound racial instincts seeking racially pure marriage partners; for instance, Cinderella with the heroine as racially pure, the stepmother as an alien, and the prince with an unspoiled instinct being able to distinguish. Writers who have written about the Holocaust have combined the tales with their memoirs, as Jane Yolen in her Briar Rose. Three individual works of Wilhelm Grimm include Altdänische Heldenlieder, Balladen und Märchen ('Old Danish