"Masked one." The name that Odin assumes in the eddic poem Grímnismál. In the story he travels to the court of king Geirröðr to settle a wager he has made with Frigg. She has meanwhile warned Geirröðr that a troll-man is coming to harm him. The king orders Odin to be tortured to make him confess, and to be set between to fires; and there he sat for eight nights. Geirröðr's son Agnar gives him something to drink and says that the king did wrong in causing him to be tortured, though innocent. Odin then begins to display his wisdom for the benefit of Agnar.
The name Grímnir appears in the Nafnaþulur in the list of names for goats and in the list of names for jötnar.
- Gylfaginning, 20.
- Skáldskaparmál, 3.