 In the "Prose Edda", Heimdallr is mentioned in the books "Gylfaginning", "Skáldskaparmál", and "Háttatal".In "Gylfaginning", the enthroned figure of High tells the disguised mythical king Gangleri of various gods, and, in chapter 25, mentions Heimdallr.High says that Heimdallr is known as "the white As", is "great and holy", and that nine maidens, all sisters, gave birth to him.