You're right Alan, Somerled was half Norse. The DNA group "Niall of the Nine Hostages" is common to Donegal and Argyle, but the question is, did it move from Argyle to Ulster or vice versa, people have been crossing/recrossing the North Channel ever since God left Govan! It was no barrier but a highway. There is however no evidence of a displaced Pictish population. skoosh.