When I was corresponding with Dr Elin Eyjolfsdottir (Celticist and Genealogist) about my Icelandic pedigrees, she had these words of wisdom which I will share with you: "As a reference point, in our genealogical records you will not find any Icelander who is not a descendant of Harald the Fair-haired, King of Norway in the 10th century, who is much later than Niall of the fifth/sixth century would have been. This is because as you know, with one set of parents, two sets of grandparents, four of great-grandparents, eight great-great-grandparents and so on and so on, you will find at least one person somewhere who is a descendant of Harald the Fair-haired. It is almost a genetic impossibility if you are of Irish descent and particularly of the Ulster region that you are not a descendant of 'a person' from Niall Noigiallach's era, but you can never be entirely sure who from². David On 2014-05-26, 12:08 PM, "Iain Kennedy" <ikennedy_msdn2@hotmail.com> wrote: