Överhogdal Tapestry between 800-1100 AD with Viking motif identified as the Yggdrasil tree. via Qhimm, via Flickr. In ch. 16 Edda: "an eagle sits on the branches of Yggdrasil and that it has much knowledge". H. E. Davidson notes parallels between Yggdrasil and shamanic lore in northern Eurasia: "This seems to be a very ancient conception, perhaps based on the Pole Star, the centre of the heavens, and the image of the central tree in Scandinavia may have been influenced by it"