Here is his story, as told in the poem Hyndluljóð (The Lay of Hyndla) from the Poetic Edda:
Óttar enters into a dispute over his inheritance (his pedigree) with another man, Angantyr. The two agree to a wager: they will challenge each other to see who has the more illustrious lineage, with the loser forfeiting all their property. Here is his story, as told in the
To protect him on the journey, Freyja disguises Óttar as her battle-boar, Hildisvini . Here is his story