Nornagest, from the Scandinavian prose "Nornagestsaga" or "Nornageststhattr", was an old man who relates the story of Sigurd and Gunnar (the Norse forms of Siegfried and Gunther), to King Olaf Tryggvason.

Also a minor character in Poul Anderson's The Boat of a Million Years.

Info on this was found at Berkeley's Online Medieval & Classical Library.