a cunning wizard with magical means of transportation: When Odin was exiled, Ollerus was chosen to take his place and ruled under the name Odin for ten years until the true Odin was called back. Poetic Edda As winter-god, Uller, or Oller, as he was also called was considered second only to Odin, whose place he usurped during his absence in the winter months of the year. During this period he exercised full sway over Asgard and Midgard. Uller was supposed to endure a yearly banishment thither, during the summer months, when he was forced to resign his sway over earth to Odin, the summer god. Ullr is mentioned in the poem Grímnismál where the homes of individual gods are recounted. The English versions shown here are by Thorpe. The name Ýdalir, meaning "yew dales", is not otherwise attested. The yew was an important material in the making of bows, and the word ýr, "yew", is often used metonymically to refer to bows. It seems likely that the name Ýdalir is connected with the idea of Ullr as a bow-god. Another strophe in Grímnismál also mentions Ullr. The strophe is obscure but may refer to some sort of religious ceremony. It seems to indicate that Ullr was an important god. The last reference to Ullr in the Poetic Edda is found in Atlakviða: Both Atlakviða and Grímnismál are often considered to be among the oldest extant Eddic poems. It may not be a coincidence that they are the only ones to refer to Ullr. Again Ullr appears to be associated with some sort of ceremony, this time the practice of swearing an oath on a ring; the ring was later associated with Thor in a reference to the Norse settlers in Dublin. Prose Edda In chapter 31 of Gylfaginning in the Prose Edda, written in the 13th century by Snorri Sturluson, Ullr is referred to as a son of Sif (with a father unrecorded in surviving sources) and thus a stepson of Sif's husband, Thor: In Skáldskaparmál, the second part of the Prose Edda, Snorri mentions Ullr again in a list of kennings, informing his readers that Ullr can be called ski-god, bow-god, hunting-god and shield-god. In turn a shield can be called Ullr's ship. Despite these details, he relates no myths about Ullr, potentially as he did not know of any. Skaldic poetry Snorri's note that a shield can