Ürüng Aiyy Toyon and Aan Alakhchyn Khotun, the supreme divine couple enthroned in the ninth heaven, bore Nyurgun Bootur and Tuiaarima Kuo in the Upper World, then sent them down to the Middle World — he as the champion of the Aiyy to defend humanity against the Abaahy, she as a radiant figure whose beauty draws the darkness toward her.
⚠ Parentage varies across Olonkho regional traditions — some variants name a different Aiyy lord as Nyurgun Bootur's father, while the Oiunsky redaction and central Yakut tradition consistently attribute his origin to the supreme divine couple.
Ürüng Aiyy Toyon and Arsan Duolai stand as eternal antagonists in the Sakha cosmos — the lord of the ninth heaven and the master of the Lower World, light against corruption, their war played out through the champions and demons they send into the Middle World.
Ürüng Aiyy Toyon reigns over Üöhee Doydu from the ninth and highest heaven, where his throne of light overlooks the eight descending tiers and all the Aiyy who dwell within them.
Ürüng Aiyy Toyon planted Aal Luuk Mas, the great World Tree, to stand at the center of all existence — its roots drinking from the Lower World, its trunk rising through the Middle World, and its crown piercing the ninth heaven where the supreme deity himself resides.
Ürüng Aiyy Toyon leads the Aiyy as their supreme lord, ruling the host of benevolent sky deities from his throne in the ninth heaven and directing their work of sustaining human life in the Middle World.
Tengri, the supreme sky deity of the Central Asian steppe, is the same god worshipped across Turkic, Mongolian, and Sakha traditions — in the Sakha north he took the name Ürüng Aiyy Toyon and acquired an elaborate celestial court, but the core identity as the eternal sky who rules all from above persists across all three.
⚠ Some scholars (e.g., Potapov) argue Ürüng Aiyy Toyon developed sufficiently distinct attributes to warrant separate identity from core Tengri, while others (Alekseev, Ksenofontov) treat him as the Sakha reflex of the pan-Turkic sky god.
Ürüng Aiyy Toyon bestows the three kut — iye-kut, buor-kut, and salgyn-kut — upon every human being, sending them down through Ieyiekhsit and Aiyysyt so that each newborn child in the Middle World awakens with a soul bound to the light of the Upper World.
Ürüng Aiyy Toyon entrusted Dyesegei Aiyy with the care of horses, sending the first divine steed down from the Upper World so that the Sakha people would have the animal that sustains their life on the steppe and tundra.
Ellei Bootur lifted the first choron of kumiss skyward toward Ürüng Aiyy Toyon, founding the Ysyakh festival that gathers the Sakha people each midsummer to honor the Aiyy gods and celebrate the return of light and warmth.
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