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Arcturus and the Great Bear
The Three Grail Maidens
"The Celtic word for bear was arth or arthe, Latinsed as Artos, which can be found in place names and gives rise to the name of 'Arthur'. In the Pyranees, in the Valley of the Bear, there is a 6th century BC inscription to a Celtic god Arthe, and it reads 'Our Holy Father Arthe'. The constellation of the Great Bear is known in Wales as 'Arthur's Wain'. King Arthur is sleeping in an underground cave until Britain needs him recalls a bear in hibernation. It seems likely that Arthur was originally a sun god, and Yule was called Alban Arthur or 'Arthur's Time' by the Celts. The bear rising from his underground sleep represented the rebirth of the sun from the underworld at midwinter.
In fact King Arthur has been identified with one specific star __ Arcturus. He has also been identified with the Sun and his Round Table has been described as being symbolised by the area of sky surrounding the Pole Star.