Spread of genes for light skin into dark-skinned Europe: https://www.independent.co.uk/news/science/how-europeans-evo...
"Once the first farmers from the near East began to arrive in Europe, and who carried both genes for light skin, they began breeding with the “indigenous hunter gatherers”. One of the depigmentation genes became prominent throughout Europe to the point where central and southern Europeans developed lighter skin."
https://www.bbc.com/news/science-environment-42939192
7,000-Year-Old Human Bones Suggest New Date for Light-Skin Gene
https://www.livescience.com/42838-european-hunter-gatherer-g...
Ancient human genomes suggest three ancestral populations for present-day Europeans
https://arxiv.org/abs/1312.6639
Early farmers from across Europe directly descended from Neolithic Aegeans