There was a paper in early 2000s with some mathematical modeling about that, see https://www.scientificamerican.com/article/humans-are-all-more-closely-related-

There was a paper in early 2000s with some mathematical modeling about that, see https://www.scientificamerican.com/article/humans-are-all-more-closely-related-than-we-commonly-think/ https://www.scientificamerican.com/article/humans-are-all-mo... TLDR all Europeans may have a common ancestor as late as 1400 BCE, maybe 55 CE.