Roger of Sheffield, do I detect a note of jealousy because 'ours is bigger than yours'? Seriously though, I think the legend of the stone that roars when the rightful prince or king stands on it comes from somewhere else. I vaguely remember that it was something to do with the O'Neill royal family's crowning, and had a footprint on its surface. Or it might even be the stone that once lay beneath the English throne at Westminsterand is now I believe back in Scotland? The website from which you got the story is linked to the more orthodox archeological website that you provided in your post. It appears to be owned by a group of 'spiritualists' and I wonder if they have their various mythologies mixed up?