While Gaelic folk history has maintained that the Irish came to Ireland from Spain, genetic research at Trinity College in Dublin, Ireland, may well indicate that this history is correct. There is a DNA link between northern Spain and Portugal, and Ireland, Scotland, Wales and Cornwall. Conventional belief was that the Celts, originally Indo-European, invaded the Atlantic lands in a massive migration 2500 years ago. The fact is that the people who are now the Celts of Ireland are part of a group that moved from Spain, beginning about 6,000 years ago until 3,000 years ago. Accordingly, we have to think in terms much further back in time for the creation of Celtic culture and regard it now as indigenous to the Atlantic fringe, of northern Spain, Portugal and Ireland. Archaeologists have also been questioning the links between the Celts of eastern France and southern Germany, and the people of the British Isles, and the new research appears to prove their theories.
Dr. Daniel Bradley, genetics lecturer at Trinity College claimed that the Irish and Scots have more in common with the people of northwestern Spain than Central Europe. His study into Celtic origins revealed close affinities with the people of northwestern Spain, including the Celtic regions (Galicia, for example), but also the Basque region.
In Irish mythology, the Milesians, who represented the final wave of invaders of Ireland, were believed to represent the Goidelic (or Gaelic) speaking Celts. Milesians were descendants of Mil Espaine, the Irish form of the Latin – Miles Hispaniae, or soldier of Hispania. The Milesians were believed to have come to Ireland from Brigantia (today Betanzos) near La Coruna, Galicia. Perhaps there is some truth to some aspects of Irish legends, and our conclusion is that the bards must have had extremely long memories.