Biography
There are at least 2 bands called Ulfhethnar:
(1) A German RAC/black metal side-project by Widar of Bilskirnir fame.
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(2) An Argentine black metal band from the group called The Southern Elite Circle (also includes Nachtgeblüt, Campo de Mayo, and Argenraza).
Biography text from Last.fm, available under CC BY-SA.