In early Germanic paganism, *Wulþuz ("glory"; Old Norse Ullr) appears to have been a major god, or an epithet of an important god, in prehistoric times. The term wolþu- "glory", possibly in reference to the god, is attested on the 3rd century Thorsberg chape (as owlþu-), but medieval Icelandic sources have only sparse material on Old Norse Ullr.
The Old English cognate wuldor means "glory" but is not used as a proper name, although it figures frequently in kennings for the Christian God such as wuldres cyning "king of glory", wuldorfæder "glory-father" or wuldor alwealda "glorious all-ruler".
The medieval Norse word was Latinized as Ollerus. The Modern Icelandic form is Ullur. In the mainland Scandinavian languages the modern form is Ull.
Read more about Ullr: Gesta Danorum, Poetic Edda, Prose Edda, Skaldic Poetry, Etymology, Toponymy, Rydberg's Theories, Popular Reception