Sif bore Ullr before her marriage to Thor, making Ullr Thor's stepson and a member of the Æsir household, though his biological father goes unnamed in surviving sources.
Ullr dwells in Ýdalir, the Yew-dales, a hall set among the yew trees sacred to the bow-god, as Odin names it among the divine dwellings in Grímnismál.
The Æsir are the principal tribe of Norse gods who dwell in Asgard, including both native members and Vanir hostages received after the Æsir-Vanir War, as catalogued in Gylfaginning.
In Saxo's Gesta Danorum, Baldur and Ullr are rivals — Baldur (Balderus) wars with Høtherus over Nanna, while Ullr (Ollerus) seizes the throne during Odin's exile, a tradition far removed from the Eddic accounts.
According to Saxo Grammaticus, Ullr temporarily replaced Odin as ruler of the gods during a ten-year exile, wielding Odin's authority and even taking his name until Odin returned to reclaim his throne.
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