Wikipedia
Svipdagsmál or The Lay of Svipdagr is an Old Norse poem, a part of the Poetic Edda, comprising two poems, The Spell of Gróa and The Lay of Fjölsviðr. The two works are grouped since they have a common narrator, Svipdagr. Moreover, they would appear to have a common origin since they are closely similar in use of language, structure, style and metre ( ljóðaháttr). These two poems are found in several 17th-century paper manuscripts. In at least three of these manuscripts, the poems are in reverse order and separated by a third Eddic poem titled Hyndluljóð. For a long time, the connection between the two poems was not realized, until in 1854 Svend Grundtvig pointed out a connection between the story told in Grógaldr and the first part of the medieval Scandinavian ballad of Ungen Sveidal/Herr Svedendal/Hertig Silfverdal. Then in 1856, Sophus Bugge noticed that the last part of the ballad corresponded to Fjölsvinnsmál. Bugge wrote about this connection in Forhandlinger i Videnskabs-Selskabet i Christiania 1860, calling the two poems together Svipdagsmál. Subsequent scholars have accepted this title.