Genetic Map of Greece

Map found on redditThe map above shows the regional genetic map of Greece based on the DNA from different time periods: Bronze/Iron Age, Roman era, Medieval Slavic, and Ottoman era Turkish.

It comes from this article: A genetic history of the Balkans from Roman frontier to Slavic migrations.

Here are the key things to know:

First the % totals.

Region	Aegean Bronze and Iron Age	Roman Era Anatolian	Early Medieval	West Anatolia Ottoman
Greek Macedonia	38.8%	11.1%	40.2%	10.0%
Greek Peloponnese	24.7%	39.2%	29.9%	6.2%
Greek Cyclades	0.0%	75.8%	19.7%	4.5%
Cretan	0.0%	73.3%	17.9%	8.8%
Greek Dodecanese	0.0%	84.4%	3.5%	12.1%

Here’s a summary of the study:

Here, we present genome-wide data from 136 Balkan individuals dated to the 1^st millennium CE.

Despite extensive militarization and cultural influence, we find little ancestry contribution from peoples of Italic descent. However, we trace a large-scale influx of people of Anatolian ancestry during the Imperial period.

Between ∼250 and 550 CE, we detect migrants with ancestry from Central/Northern Europe and the Steppe, confirming that “barbarian” migrations were propelled by ethnically diverse confederations.

Following the end of Roman control, we detect the large-scale arrival of individuals who were genetically similar to modern Eastern European Slavic-speaking populations, who contributed 30%–60% of the ancestry of Balkan people, representing one of the largest permanent demographic changes anywhere in Europe during the Migration Period.

You can read the full article here and find the data in the map in the supplementary material.