Among the more notable adaptations of this text are Richard Wagner's tetralogy of music dramas "Der Ring des Nibelungen", Ernest Reyer's opera "Sigurd", Henrik Ibsen's "The Vikings at Helgeland", and William Morris's epic poem "The Story of Sigurd the Volsung and the Fall of the Niblungs". J. R. R. Tolkien's "The Legend of Sigurd and Gudrún" is derived instead from the Volsung poems in the Elder Edda; Tolkien himself thought the author of the Saga had made a jumble of things.