Where is Grímhildr from?

Meaning of the name Grímhildr

Old Norse cognate of Kriemhild. In the Norse Völsungasaga Grímhildr is the mother of Gunnar and Gudrun, while in the Germanic counterpart the Nibelungenlied Kriemhild is the sister of Günther and she herself has a role equivalent to Gudrun.

Characteristics of the name Grímhildr

How do we know this about Grímhildr

(and is it secret spies?)

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