Yggdrasil

Yggdrasil (Yggdrasill in Old Norse, meaning “Odin’s horse” — ygg being a name of Odin, drasill meaning “steed”) is the immense cosmic ash tree that stands at the centre of Norse cosmology. Its branches reach into the heavens; its three roots plunge into three different worlds; upon it and within it live creatures whose activities mirror and influence the fate of everything.

Structure and wells

Gylfaginning ch. 15–16 gives the most complete account. The three roots of Yggdrasil extend to three realms: one to Ásgarðr (or to the realm of the Norns and the Well of Urð), one to Niflheim where the dragon Níðhöggr gnaws at it, and one to Jötunheim where Odin’s well of wisdom (Mímisbrunnr) lies — the well from which Odin sacrificed his eye for a drink. Three wells, three roots, three domains: past, present, future, the triple structure that Norse cosmology returns to again and again.

The creatures in the tree

Grímnismál stanzas 32–35 name the inhabitants. The eagle sits at the crown, the dragon Níðhöggr gnaws at the root. The squirrel Ratatoskr runs up and down the trunk carrying messages of slander between them, keeping the tension that drives time. Four stags — Dáinn, Dvalinn, Duneyrr, Duraþrór — browse the uppermost branches. The Norns draw water from the Well of Urð each day and pour it over the roots to keep the tree alive.

Yggdrasil as ordeal-site

Hávamál st. 138 makes the tree the site of Odin’s rune-ordeal: he hangs wounded on “the windy tree” for nine nights, not fed, not given water, until he “took up the runes, screaming.” The tree is the axis where all worlds touch; the ordeal works because at Yggdrasil’s intersection, what is learned is cosmic, not merely personal.

The tree’s own suffering

Völuspá and the prose sources are at pains to note that Yggdrasil itself suffers. Níðhöggr eats at the root; the four stags eat the foliage; a serpent named Ofnir and her brood corrupt the wood. The Norns’ daily watering is restorative medicine, not merely ritual. The tree endures, as the Eddic verse puts it, “more than men know.”