Ancient DNA reveals what really happened after the Roman Empire fell

The hidden story of what happened in one corner of Europe after the Roman Empire fell has finally been uncovered.An international team sequenced DNA from 314 people who lived in the Little Hungarian Plain between the third and sixth centuries.The remains, recovered from seven cemeteries in what is now northwestern Hungary, were roughly 1,400 to 1,800 years old.By comparing DNA from people buried during Roman rule with those buried after it collapsed, researchers could see how the population changed.The Roman-era graves mostly contained people with southern European roots, along with some whose ancestry could be traced to Asia and Africa.But later graves showed a sharp rise in northern European ancestry and genetic links to people farther north, revealing that newcomers had moved into the former Roman territory and mixed with locals.Archaeological evidence suggests many were Lombards who arrived over several years, not one enormous invading army, before later conquering much of Italy.The DNA also revealed groups of close relatives within the cemeteries, showing that powerful families rose to the top and helped build a new society after Roman rule ended.The hidden story of what happened in one corner of Europe after the Roman Empire fell has finally been uncoveredFrom its founding in 625 BC to its fall in AD 476, the Roman Empire conquered and integrated dozens of cultures. The findings challenge the traditional image of isolated bands of barbarians seizing Europe as the Western Roman Empire disintegrated.Historians have long struggled to understand this turbulent period because the kingdoms that replaced Roman rule left behind few written records.Much of what is known came from Roman accounts, meaning the story was largely told from the perspective of the people who had lost control of the territory.The new study, published in Science, allowed researchers to reconstruct what happened by combining ancient DNA with archaeological evidence recovered from graves.Scientists examined 68 people from two Roman-era sites and 246 from five post-Roman cemeteries across the Little Hungarian Plain, an area in present-day northwestern Hungary.Under Roman rule, communities there were connected through a dense network of roads, settlements and trade.Most residents had ancestry associated with southern Europe, but the genetic links to Asia and Africa showed that people had traveled to the frontier region from across the vast empire. By comparing DNA from people buried during Roman rule with those buried after it collapsed, researchers could see how the population changedThat picture changed significantly after Roman authority weakened.The post-Roman graves contained a sharp increase in northern European ancestry, with genetic connections linking the dead to populations living farther north.Researchers said this change most likely reflected the expansion of the Lombards from north of the Danube into former Roman lands.However, the genetic evidence did not point to a single mass migration or the total replacement of the local population.Instead, it revealed years of sustained movement in which individuals and families traveled into the region, settled there and interacted with people whose ancestors had lived under Roman rule.The newcomers eventually emerged as the dominant political power, but local residents continued to play a role in forming the new communities.The cemeteries also revealed that these people had not simply established scattered rural settlements in the ruins of the empire.Although the communities shared similar ancestry, burial traditions and grave goods, they were organized in different ways.Some graves contained clusters of close biological relatives, suggesting that influential families held power and status within particular settlements.Those families appear to have formed wider networks connecting multiple communities and helping establish a new Lombard political system.The result was a diverse but deeply hierarchical society shaped by migration, intermarriage, family ties and cooperation, not simply conquest.The research was conducted through the HistoGenes project, an international collaboration between geneticists, archaeologists, historians and anthropologists.Lead authors Yijie Tian of Stony Brook University and István Koncz of Eötvös Loránd University in Hungary combined the genetic findings with objects, burial customs and other evidence discovered at the sites.Patrick Geary, a professor emeritus at the Institute for Advanced Study and co-leader of the project, said its work showed that population movements after Rome were far more complicated than previously believed.‘The project has revealed both gradual and localized forms of movement across short and long distances, as well as rapid, large-scale population shifts from Eastern Asia into the Carpathian Basin,’ Geary said.‘It has also demonstrated that material culture and genetic ancestry do not necessarily coincide and has illuminated the diverse ways newcomers integrated into existing populations.’