Sigrdrifa

Sigrdrifa [sig-er-dree-vah] Examples noun (in the Elder Edda)

1. a Valkyrie who, for disobedience to Odin, sleeps within a circle of fire until awakened by Sigurd.

Compare Brynhild. Examples from the Web for sigrdrifa Historical Examples of sigrdrifa

May not Sigrdrifa’s slumber break the son of warriors, against the Norns’ decrees.

The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson

Saemund Sigfusson and Snorre Sturleson