The Völsungasaga (often referred to in English as the Volsunga Saga or Saga of the Völsungs) is a legendary saga, a late 13th centuryIcelandic prose rendition of the origin and decline of the Völsung clan (including the story of Sigurd and Brynhild and destruction of the Burgundians). It is largely based on epic poetry. The earliest known pictorial representation of this tradition is the Ramsund carving, Sweden, which was created c. 1000 AD.
The origins of the material are considerably older, however, and it echoes real events in Central Europe during the fifth and sixth centuries. On the other hand, the only manuscript of the saga, Ny kgl. Saml. 1824 b 4to, dates to about 1400. In this manuscript, the saga leads straight in to Ragnars saga loðbrókar.
The Middle High Germanepic poemNibelungenlied is based largely on the old stories, which were commonly known in all of the Germanic lands from the early Middle Ages on, but reworks the material into a courtly medieval setting.
R. G. Finch (ed. and trans.), The Saga of the Volsungs (London: Nelson, 1965), available at VSNRweb-publications.org. A fine translation with facing page Old Icelandic text and a good (if dated) introduction.
Fornaldarsögur Norðurlanda and Völsunga saga in Old Norse from «Kulturformidlingen norrøne tekster og kvad» Norway.