Geoffrey of Monmouth, in recording the death of Constantine, which took place about the middle of the 6th century (Historic britonum), states that he was buried "close by Uther Pendragon, within the structure of stones which was set up with wonderful art not far from Salisbury, and called in the English tongue, Stonehenge."
In these either Merlin made the table for Uther Pendragon, or it had belonged to Leodegrance, king of Cornwall and father of Guenevere, and was given to Arthur on his marriage with that princess.
Such is the story of his begetting, where Uther takes upon him the form of Gorlois to deceive Yguerne, even as Siegfried changed shapes with Gunther to the undoing of Briinnhilde.