It's fascinating to me that the old Irish legends we learned in school tell of the 'invasions' of Ireland and especially that of 'The Sons of Mil' or Milesians, arriving in Ireland from Northern Spain to conquer the earlier people, the Tuatha De Danann who presumably came from the same area.
The DNA evidence seems to be lending support for the legend and discounting the idea of a 'Celtic' invasion from Central Europe. In effect the bulk of the population of Ireland is probably descended from a remnant people who emerged from Ice Age sanctuaries in the mountain valleys of the northern Iberian peninsula and gradually spread along the Atlantic seaboard as hunter-gatherers as the climate improved. This apparently sees them moving into Ireland along a now mostly submerged continental coastline and further north and east into what was to become the Western Isles and Scottish mainland. The origin of Old Irish language could now be the clincher if it turns out to have derived from Tartessian. Or is it still possible that the Irish language was brought to Ireland by a 'Celtic' elite which took over control and whose language displaced earlier languages?
Something is not right. This message is just to keep things from messing up down the road