quality:correction
Stonehenge I and II

Researchers studying DNA extracted from Neolithic human remains across Britain determined that the people who built Stonehenge I and II were closely related to Iberian and Central European Early and Middle Neolithic populations, modelled as having about 75% ancestry from early European farmers who came from the Eastern Mediterranean, travelling west from there, and 25% ancestry coming from Western Hunter-Gatherers from western Europe. These farmers moved to Iberia before heading north, reaching Britain in about 4,000 BC. Most of the ancestry of British Neolithic farmers came from the people who followed this route, with a minor contribution from groups who followed the Danube into Central and Western Europe. Their agricultural techniques seem to have come originally from Anatolia, and their mixture appears to have happened primarily on the continent before the Neolithic farmers migrated to Britain.

At the time of their arrival, Britain was inhabited by groups of hunter-gatherers who were the first inhabitants of the island after the last Ice Age ended about 11,700 years ago. The farmers replaced most of the hunter-gatherer population in the British Isles without mixing much with them.

Despite their mostly Aegean ancestry, the paternal (Y-DNA) lineages of Neolithic farmers in Britain were almost exclusively of Western Hunter-Gatherer origin. This was also the case among other megalithic-building populations in northwest Europe, meaning that these populations were descended from a mixture of hunter-gatherer males and farmer females. The dominance of Western Hunter-Gatherer male lineages in Britain and northwest Europe is also reflected in a general 'resurgence' of hunter-gatherer ancestry, predominantly from males, across western and central Europe in the Middle Neolithic.