In Norse mythology, Ymir, also called Aurgelmir, Brimir, or Bláinn, is the ancestor of all jötnar. Ymir is attested in the Poetic Edda, compiled in the 13th century from earlier traditional material, in the Prose Edda, written by Snorri Sturluson in the 13th century, and in the poetry of skalds. Taken together, several stanzas from four poems collected in the Poetic Edda refer to Ymir as a primeval being who was born from Eitr, yeasty venom that dripped from the icy rivers called the Élivágar, and lived in the grassless void of Ginnungagap. Ymir gave birth to a male and female from his armpits, and his legs together begat a six-headed being. The grandsons of Búri, the gods Odin, Vili and Vé, fashioned the Earth from his flesh, from his blood the ocean, from his bones the mountains, from his hair the trees, from his brains the clouds, from his skull the heavens, and from his eyebrows the middle realm in which mankind lives, Midgard. In addition, one stanza relates that the dwarfs were given life by the gods from Ymir's flesh and blood.

Norse, Nordic, or Scandinavian mythology, is the body of myths belonging to the North Germanic peoples, stemming from Old Norse religion and continuing after the Christianization of Scandinavia, and into the Nordic folklore of the modern period. The northernmost extension of Germanic mythology and stemming from Proto-Germanic folklore, Norse mythology consists of tales of various deities, beings, and heroes derived from numerous sources from both before and after the pagan period, including medieval manuscripts, archaeological representations, and folk tradition. The source texts mention numerous gods such as the thunder-god Thor, the raven-flanked god Odin, the goddess Freyja, and numerous other deities.