This web site doesn't set out to be in any way definative. In many ways it's simply a collection of information and facts which I've accumulated on the subject. Thanks to many people for their contributions.
Early history is mythology.
The Celts were literate but even well into Christian times believed it was a sin to commit important knowledge to writing - their tradition was oral. But equally we should be wary of documented history - it is often biased and little more than myth itself. We must also be careful not to romanticise hard and brutal times. We're unique because of the Celtic Gaelic culture and heritage not because of a clan type social structure. Mankind has seen such social orders a thousand times before - but there have only been one Gaels.