Scientists Compared Serbian DNA to Every European Nation — Half of It Arrived After Rome Fell

👇Decode your DNA results 👇 https://theorigindna.com/ Save 15% with code OriginYT Serbian DNA: 136 Ancient Skeletons, 1,000 Years, and a Surprising Split Trace a Serbian family tree back to the age of the Avars and Slavic settlement. Roughly half of the branches lead to newcomers arriving from Eastern Europe. The rest lead to people who were already at home in the Balkans. This video shows how ancient DNA turned that picture from folklore into measurement. The question Did Slavic migrants replace the people who lived in the Balkans, or did the two groups merge? To find out, an international team led by Iñigo Olalde and including David Reich's lab at Harvard sequenced 136 Balkan individuals from about 1–1000 CE. They worked with Serbian scientists, including Miodrag Grbić, and compared the ancient DNA with Iron Age populations and with 37 living Serb men. The evidence The method: DNA recovered from the dense inner-ear bone, which can hold far more of a person's own DNA than other bones. The cast: Illyrians (western Balkans), Thracians and Triballi (east), the mixed Scordisci at Belgrade's doorstep, then the Roman frontier at Viminacium, Singidunum, Sirmium and Naissus. The paternal lines: about 37–42% of Serbian men carry I2a, about one in five carries E-V13, and about 15% carry R1a. The answer Modern Serbs have about 50–60% ancestry linked to Eastern European, Slavic-speaking populations. The remaining 40–50% comes from earlier Balkan populations. Croats, Bulgarians and Romanians fall in the same range. Three twists Anatolia in Roman Serbia. 15 of 45 individuals from the first 250 years AD carried mostly western Anatolian ancestry, and very little came from Italy. A genetic tide. Slavic-related ancestry fades from 50–60% in Serbia to 30–40% in mainland Greece and 4–20% on the Aegean islands. Maps that don't match. Romanian and Greek speakers carry Slavic-related ancestry without speaking Slavic languages. The fine print DNA gives proportions, not scenes. It can't say whether settlement was peaceful or violent, and the study's authors note gaps in the sampling. A 2025 Nature study found that in eastern Germany, Poland and Croatia the newcomers replaced over 80% of the local gene pool. It also found wide regional variation, so the Slavic expansion was a mosaic, not one event. The video ends on the conclusion that no population is unmixed. Key References & Sources Primary studies Olalde et al., "A genetic history of the Balkans from Roman frontier to Slavic migrations," Cell, Dec 2023 Gretzinger et al., "Ancient DNA connects large-scale migration with the spread of Slavs," Nature, 2025 Historical sources discussed Herodotus, Histories, Book 5 (the Thracians) Suetonius's account of the Great Illyrian Revolt, AD 6–9 Want to look at your own results? The Origin DNA has a three-volume PDF guide bundle on reading raw data and finding relatives: [add link here] Know someone curious about where they come from? Send them this video, subscribe for the next deep dive, and tell us in the comments which finding surprised you most. #PopulationGenetics #DNAHistory #RomanFrontier #SlavicHistory #AncestryExplained