Geirrod

Loki was flying as a hawk one day and was captured by Geirrod. Geirrod, who hated Thor, demanded that Loki bring his enemy (without his magic belt and hammer) to Geirrod's castle. Lokie agreed to lead Thor to the trap. Grid, a giantess at whose home they stopped on the way to Geirrod's. She waited until Loki left the room then told Thor what was happening and gave him her iron gloves and magical belt and staff. Thor killed Geirrod, and all other frost giants he could find (including his daughters, Gjalp and Greip).