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The Origin of the Irish and Scottish Gaels as revealed by their DNA

Celts and Romans fightingPART II: The origin of the Gaels has remained a mystery until the advent of modern commercial ancestral DNA testing. Commercial ancestral Y-DNA testing has revealed that 60% of Irish males will have a pre-Viking Gaelic origin, and that almost all of those will have earlier detectable links with Scotland (the Y-DNA test only explores the paternal line). But Irish Gaels don’t typically match just any Scots, they match the Gaelic speaking Scots whose genetic signature dominates Western Scotland (see attached image). Gaelic Scotland map Probably not a surprise as the Irish and Scottish Gaels share common language (Gaelic), common surnames (typically denoted by Mac’ or Mc’), sports (Irish Hurling, Scottish Shinty) and national drink ‘Irish Whiskey’ or ‘Scotch Whisky.’ However, the concept of the Scots being descended from a ‘tribe’ from Ireland who invaded Scotland does not hold true (if that were the case then Scots Gaels would have earlier detectable links with Ireland, they simply don’t). In fact the term ‘Scotti’ appears to have been a term used by the later Anglo-Saxons to describe someone who spoke Gaelic. For the Irish, the DNA evidence rules out a native origin of the Gaels (i.e. descendants of the pre-historic inhabitants of Ireland who absorbed the ‘Celtic’ Hallstatt and La Tene cultures). In fact, less than 1% of Irish males have a prehistoric male Y-DNA signature. What the DNA shows is that Ireland was swamped within a very short time by a ‘Proto-Gael’ people who poured in from Western Scotland. BUT when and where did these Proto-Gaels (who would go on to form the distinctive Irish Gael and Scottish Gael identity) come from? Were the Proto-Gaels the Prehistoric inhabitants of Scotland, who one day decided to invade and turn Ireland Gael? The answer is NO! If you are an Irish or Scottish male of Gaelic origin, then your paternal ancestors are relatively recent arrivals, having first stepped foot in Scotland and Ireland approxmately 2,000 years ago!

If you have Gaelic paternal origins then some of your most distant genetic relatives revealed upon Y-DNA testing will reveal their ancestors within modern Bohemia, and it is there in the western borderlands of the modern Czech Republic that the journey of the Gaels as recorded by their DNA began (see attached image). At some point the ‘Keltoi’ people of Bohemia began crossing the Erzegebirge Mountains into modern Southern Germany, where they followed the River Main towards the Rhine. At the height of Celtic Hallstatt and La Tene Cultures the settlement of ‘Glauberg’ which lies close to the area where the River Main joins the Rhine became a Centre of Supra-regional importance. Glauberg also marks a crucial point of divergence. The hundreds of Irish, Scottish, English and Welsh DNA studies that I have performed over the years have revealed that the Celts would use the Rhine to spread throughout Central Europe. Those that spread north would give rise to the ‘Celtic’ tribes that would come to dominate the modern area of Belgium and the Netherlands, before making the short crossing into Britain and giving rise to the Britons (the ancestors of most English and Welsh males today). But the ancestors of the Gaels (the Proto-Gaels) were part of a Celtic group that headed south colonizing the upper reaches of the Rhine, spreading towards modern Switzerland and even crossing the Alps into what is now Northern Italy. The rise of the ROMAN EMPIRE would change everything!

Cermano Celtic tribes The Celts would dominate Central Europe until the emergence of the Romans. The DNA studies performed for males with Gaelic Irish or Scots origin reveal that they invariably share a common paternal ancestor that lived between 2,000 and 2,600 years ago within the area located between the Rivers Moselle and Rhine, which forms much of the modern borderlands of France and Germany. The DNA points to an exodus of Proto-Gaels from that area approximately 2,000 years ago. With every human exodus there are push and pull factors, and historically we know that that this area was conquered by the Romans in 58BC (Battle of the Vosges) who fortunately also recorded the tribes they found there including the ‘Nemetes’ and ‘Tribocci’ whose territory hugged the western bank of the Rhine (see attached image). The Romans were brutal. Roman Conquest was crushing, involving slaughter, slavery and assimilation for the lucky few. Julius Caesar himself described the Battle of the Vosges in The Gallic Wars as follows; then at last of necessity the Germans drew their forces out of camp and disposed them canton by canton, at equal distances, the Harudes, Marcomanni, Tribocci, Vangiones, Nemetes, Sedusii, Suevi; and surrounded their whole army with their chariots and wagons, that no hope might be left in flight. On these they placed their women, who, with disheveled hair and in tears, entreated the soldiers, as they went forward to battle, not to deliver them into slavery to the Romans.’ Caesar of course won the day, and after their defeat by the Romans the inhabitants of the lands between the Rhine and Moselle (those not enslaved) faced a dilemma; assimilate or flee (some would stay, and be absorbed by Rome, and their descendants’ would in time become French or German)! But the Proto-Gaels who chose to flee could not go west or south (areas already controlled by the Romans), nor could they go east as the ‘true’ Germanic tribes were constantly buckling against the eastern border of the expanding Roman Empire. Their only option was to follow the Rhine north into Britain and exile among their distant cousins ‘the Britons.’

Exodus of the Proto-Gaels into Britain The exodus of Proto-Gaels (a mix of defeated ‘Celtic’ tribes from between the Moselle and Rhine) had begun; they sailed down the Rhine and poured into Britain. By the time they arrived in Britain these exiled Proto-Gaels were probably quite distinct from their distant Briton cousins, with the Britons speaking what would eventually become the ‘Welsh’ language, and the Proto-Gaels speaking what would eventually evolve into Irish and Scottish Gaelic. But the Romans under Julius Caesar were literally hot on their heels and he himself would invade Britain less than 3 years later in 55 and 54 BC. The shock of a Roman landing in Britain must have been immense, it propelled the Proto-Gaels north, they would not stop until they settled permanently beyond the Clyde Estuary and the Firth of Forth in Northern Scotland (although the DNA does suggest a small group that broke off and sought refuge in Devon and Cornwall in the far Southwest of England). Formation of the Scottish and Irish Gaels In summary, the majority of Proto-Gaels would keep one step ahead of the Roman advance and would settle in the inhospitable lands of the Highlands and Islands of Scotland, or cross the sea into what the Romans aptly named ‘Hibernia’ (land of winter); both of which lay beyond the reach of permanent Roman settlement. The Antoine Wall (begun in 142 AD) would mark the northern most limit of the Roman Empire and stretched from the Clyde to the Firth of Forth in Scotland (see attached image). Free from Roman persecution the descendants of the Proto-Gael refugees would evolve into the Scots and Irish Gaels that would shape the modern identities of Scotland and Ireland. The Gaels from Ireland would in turn plague Roman Britain for centuries with raids along its coast (one such raid would later bring back a Romano-Briton slave boy known as Patricius).

The Celts that remained in Central Europe would be subsumed into the peoples and nations that evolved over the following millennia, and today males with a ‘Celtic’ Y-DNA signature have contributed in part to the modern Czechs, Southern Germans, Northern Italians and Belgians. Besides their DNA, their legacy can be found in significant archaeological evidence, some linguistic traces (e.g. Asal and Esel mean Donkey in modern Gaelic and German respectively), and of course historical accounts of victorious Roman Generals. Other subtle clues can still be found! For example the Celtic ‘Boii’ gave their name to their original homeland of ‘Bohemia,’ with Boii translating as ‘the Herding or Warrior people.’ It can be argued that the Gaels were more pastoralists than cultivators, and remarkably ‘Bo’ in modern Gaelic can mean ‘cow’ and/or ‘victory’ (Gallaimh Ubu is the cry of Galway’s Gaelic football and Hurling fans). The great warrior Queen of the Britons who fought the Romans was Boudica (‘the Victorious one’) of the Iceni tribe. In addition, my own surname ‘Bowes’ is an anglicized form of Gaelic Irish ‘O’Boy’ (Grandson of the Victorious one); a reference perhaps to a notable founding paternal ancestor who was victorious in some battle fought in the Irish Midlands approximately 1,000 years ago?

I have added a 2 part DNA study commissioned by Margaret Nolan (contact: for a gentleman named Burns (the Scottish form of the Irish ‘O’Byrne’ surname) which has helped me to reconstruct the story of the Gaels. In the first Case Study I demonstrate how commercial ancestral Y-DNA testing can pinpoint an origin for one's paternal ancestor 1,000 years ago when Gaelic surnames first appeared (click here to download Part I). Part II demonstrates how one’s more distant genetic matches allow one to reconstruct one’s ancient paternal ancestral journey (click here to download Part II).

What will your DNA reveal? Contact Irish Origenes to find out about a suitable painless commercial DNA test for you (CLICK HERE), or for a FREE CONSULTATION on your DNA test results. 

REMEMBER FOLKS; your DNA results are produced in a scientific lab by trained scientists (I spent almost 20 years working in such labs). Always check the scientific qualifications of a blogger or Genetic Genealogist before employing their services or taking their advice. An honorary scientific title does not mean they are qualified (certain Universities should know better!). If you want to read more about the Irish Gaels then CLICK HERE for PART I.

English Origenes

Scottish Origenes