The story of Hildisvíni appears in Hyndluljóð, an Old Norse poem found in Flateyjarbok but often considered a part of the Poetic Edda. In the poem, Freyja is searching for the ancestry of her protégé, Óttar. Freyja rides on her boar Hildisvíni, who is in fact Óttar in disguise. They meet Hyndla who is a seeress. Freyja succeeds in forcing Hyndla to tell Óttar about his ancestors.