Ullr - or Ull - was one of the Nordic gods - it seems he was more known in Norway, Sweden and Iceland than in Denmark. Ullr was a son of Sif and a (step)son of Thor (although it says 'Odin' in the images below). In Skáldskaparmál, the second part of the Prose Edda, Snorri mentions that Ullr can be called ski-god, bow-god, hunting-god, and shield-god. Scholars have theorized a potential connection between Skaði and the god Ullr.
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Ullr. From the 18th century Icelandic manuscript SÁM 66 in the care of the Árni Magnússon Institute in Iceland.
An illustration of the god Ullr, from an Icelandic manuscript, 1760. The runes read: 'Ull, Odin's son, with his bow, runs here on skis'.