The British are Basques?
But what is the truth of our origins? Over to Professor Stephen Oppenheimer of Oxford University, who says some 81% of the Welsh have DNA evidence which shows a common link to ancestors who came to Britain from northern Spain many thousands of years ago.
In fact, many Britons share a gene pool that can be traced back to Basque. Around three-quarters of the Welsh, Scots and English can be traced to those who arrived from the Basque country between 7,500 and 15,000 years ago.
Based on research into DNA studies across the UK and Ireland over the past 10 years, the professor's theory on British origins challenges mainstream historical views. And it might horrify those who like to think they are a distinct race apart from the English.
Most people in Scotland, Ireland and Wales were assumed to be descended from Celtic farming tribes who migrated here from central Europe up to 6,500 years ago. The English were thought to largely take their genetic line from the Anglo-Saxon invaders of the Dark Ages who supposedly wiped out the Celts in England.
But that's all part of a "Celtic myth", says Professor Oppenheimer in The Origins of the British: A Genetic Detective Story.
"The majority of the gene pool of the British Isles is very ancient and dates to the era after the last great Ice Age. It has nothing to do with Celts or Anglo-Saxons or any more recent ethnic labels.
"The Ice Age made Britain a polar desert and there was nobody living here around 13,000 BC until the first settlers came to the British Isles from the Basque country of northern Spain between 15,000 and 7,500 years ago.
"Something like three-quarters of the ancestors of our modern gene pool arrived then.
"The ancestors of some 88% of the Irish, 81% of the Welsh, 79% of the Cornish, 70% of Scots and 68% of the English arrived here during that period. None of the later immigrations contributed anything more than 5% to the gene pool."
So genetically speaking, according to the Professor, a member of Green College, Oxford, the Welsh have more in common with the English than they have differences.
"There is also no evidence of Celtic languages being spoken until much later, so most of these people probably spoke something like Basque, and though it is controversial, there is structural evidence of Basque influence on later Celtic languages and English as well."
Some historians believe cultural, political and social differences were much more significant in the development of the British peoples and many may dispute Prof Oppenheimer's theory that the first settlers, arriving around 9,000 years ago, came from one specific area as being very restrictive.
But Aberystwyth-born geneticist, Prof Steve Jones, concurs with the latest findings, saying the Welsh and the Irish are among the most homogeneous people in the world - though they remain markedly different from the English.
Prof Jones and colleagues at University College London, spent years creating a genetic map of the Y chromosome, which is passed by males from generation to generation.
The results show the Welsh are related to the Basques of northern Spain and southern France and to native Americans. All are descended from the Kets people of western Siberia.
Prof Jones, author of Y - The Descent of Man, said the Y chromosomes showed a marked difference between males on the Welsh and English side of the border.
"This shows that in the Dark Ages, when the Anglo-Saxons turned up, there was the most horrible massacre on the English side. They killed everybody and replaced them.
"The Welsh Y chromosome is similar to that of the Basques. In the male line, at least, the Welsh and the Basques are survivors or relics of a period before huge numbers of farmers filled Europe from the Middle East.
"There has been much less inter-breeding in Wales than you might expect. Wales and Ireland have the most homogenous group of males anywhere in the world."
The genetics show that the Welsh are not related to the Cornish, despite the similarity of their languages. "The Cornish are in effect Anglo-Saxons who for a time used a language that was hanging around."
The genes of Scottish males also showed considerable inter-mixing with outsiders. Prof Jones said genetics provided more reliable clues to the distant past than language. He said the Y chromosome common among Welsh males was an ancient one.
In 2001, scientists at the University of London, led by Professor David Goldstein, discovered that Welsh and Irish Celts were the "genetic blood-brothers of Basques".
Researchers concluded that the gene patterns of the three races passed down through the male line were all "strikingly similar".
Basques can trace their roots back to the Stone Age and are one of Europe's most distinct people, fiercely proud of their ancestry and traditions.
The research added to previous studies which have suggested a possible link between the Celts and Basques, dating back tens of thousands of years.
"The project started with our trying to assess whether the Vikings made an important genetic contribution to the population of Orkney," said Prof Goldstein, who was working on a BBC television programme on the Vikings.
He and his colleagues looked at Y-chromosomes, passed from father to son, of Celtic and Norwegian populations, and found them to be quite different.
"But we also noticed that there's something quite striking about the Celtic populations, and that is that there's not a lot of genetic variation on the Y-chromosome," he said.
To try to work out where the Celtic population originally came from, the team from UCL, the University of Oxford and the University of California at Davis also looked at Basques.
"On the Y-chromosome the Celtic populations turn out to be statistically indistinguishable from the Basques," Professor Goldstein said.
The comparison was made because Basques are thought by most experts to be very similar to the people who lived in Europe before the advent of farming.
"We conclude that both of these populations are reflecting pre-farming Europe," he said.
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