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but that the peoples of the English heartland fell victim to genocide by the Anglo-Saxon hordes during the fifth and sixth centuries. Now Stephen Oppenheimer’s groundbreaking genetic research has revealed that the ‘Anglo-Saxon invasion’ contributed only a tiny fraction to the English gene pool. In fact, three quarters of English people can trace an unbroken line of genetic descent through their parental genes from settlers arriving long before the introduction of farming.If the population contracted by means other than conquest I would think that could make a case for catastrophism. The fifth-to-sixth century dating coincides with some evidence to that effect which you've previously posted.