He resided at Ydalir (Yew Dales). Although not much has been recorded about Ull, he must have been a very prominent deity in the Norse pantheon

at one time because, according to one tradition, the god Odin offered Ull's favours as a reward to the one who would aid him.

Is Odin a ULL?

Ullr (pronounced “ULL-er,” often Anglicized as “Ull,” and also occasionally referred to as “Ullinn”) is an obscure and enigmatic Norse god. ... Elsewhere in the poem, Odin, who is entrapped between two fires, promises the blessings of “Ullr and all the gods” on whomever will rescue him.

Is Ullr vanir or aesir?

Based on the association of Ullr and Ullinn placenames with Vanir deities, Ernst Alfred Philippson suggested that contrary to his placement in the Prose Edda among the Æsir, he was himself one of the Vanir, and the similarity between the Prose Edda description of his characteristics and those of Skaði have suggested to ...