 The Nine Mothers of Heimdallr are mentioned in two books of the "Prose Edda"; "Gylfaginning" and "Skáldskaparmál".In "Gylfaginning", Heimdallr is introduced in chapter 25, where the enthroned figure of High tells the disguised mythical king Gangleri details about the god.Among other details, High says that Heimdallr is the son of nine sisters and, as a reference, provides two lines of the (otherwise now lost) poem "Heimdalargaldr", in which Heimdallr says that he was born of nine sisters