I would believe it because it has been in every book on the Celtic or on ancient Irish culture I had ever read. And until now no other theories have ever been turned up in my own reading/research. I find it difficult to believe that if the whole thing is based on the idea of one man. Surely the genesis of the idea would have turned up in a book before now. Why would you and the fella that ran the site be the only ones who find this out and the rest of us are being kept in the dark. Of all the professors of Celtic history no one noticed this flaw before? Of course none of this proves I'm right, I could well be wrong, and I will indeed do some more research over the Christmas. (I'm planning on doing a post-grad in Celtic Studies so you might just end up blowing that out of the water;P) I don't ever recall reading what the ancient Irish called themselves, do you know?