Ancient DNA from more than 4,500 people traces where English, German and Scandinavian languages came from

DNA from more than 4,500 ancient individuals points to a previously unknown migration into Scandinavia about 4,000 years ago, in a Nature study published on Nov. 4. The University of Copenhagen and Leiden University led the work, with Hugh McColl as lead author and Eske Willerslev as senior author. The team suggests the newcomers may have carried the earliest ancestor of the Germanic languages, the family that includes English, German and the Scandinavian tongues.

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The dataset includes 712 genomes sequenced for the first time. Willerslev stressed a limit up front: DNA sequences do not directly show which language people spoke, so the genetic story had to be read against linguistic and archaeological evidence.

A Baltic-linked arrival about 4,000 years ago

McColl, an assistant professor at Copenhagen’s Globe Institute, described the migration as a real surprise, one that fell at the time and place a linguist would need. According to the University of Copenhagen release, the arrival may have introduced the earliest ancestor of Germanic, which would make the family about a thousand years younger than earlier models assumed. The Brighter Side’s summary of the paper adds specifics: the incoming people probably came from the northeastern Baltic, and the researchers call the ancestor Palaeo-Germanic. The arrival is placed about 800 years after the steppe-related migration of roughly 4,800 years ago that had often been linked to Germanic’s ancestral branch, per that account of the paper.

The scale of the project is part of the case. The University of Gothenburg’s account says the team analyzed DNA from over 4,500 ancient individuals, led by the University of Copenhagen, Leiden University and the University of Gothenburg. The Brighter Side reports that 4,587 people were analyzed in total, of whom 4,009 had been published earlier, which means most of the strength of the study comes from pooling old data with new sequencing.

Northern Germans in Denmark and southern Sweden

A second movement came much later. Around 1,500 years ago, people from present-day northern Germany moved into Denmark and southern Sweden, becoming a major part of the population on Zealand. The University of Gothenburg’s version of the story dates the largest shift to about 1,600 years ago, so the two institutions bracket the same event. Kristian Kristiansen, professor of archaeology at the University of Gothenburg, called that the study’s major surprise. His account at Gothenburg links the change to the arrival of a new religion centered on Odin and to a material culture he associated with the Huns, and he concluded that many Danish and Swedish Vikings shared roots with the Anglo-Saxons. The newcomers were genetically close to the groups that contributed to the Anglo-Saxons, which may explain the long-noted likeness of Viking and Anglo-Saxon art and language.

A photograph supplied with the release shows McColl and Willerslev at Ales stenar, a stone ship-setting overlooking the Baltic in southern Sweden, a monument dated to roughly 600 to 1000 CE. Willerslev said that, with ancient genomes at this scale, researchers can begin to trace how languages spread and changed over thousands of years. Kristiansen added that questions unresolved for generations can now be addressed. Their framing is deliberately about testing models: archaeologists, linguists and geneticists each hold part of the answer, and none alone can say who spoke what.

The Celtic companion paper and the limits of ancient DNA

Nature ran a companion study on Celtic. It points to a movement from central Europe about 3,000 years ago, spreading west into France, Britain, Ireland and the Iberian Peninsula, which challenges the idea that Celtic began on the Atlantic coast. The Gothenburg account calls this the simplest explanation, not settled proof. Other caveats sit in the paper itself, which carries the DOI 10.1038/s41586-025-09064-1. Migrants are plausible carriers of a language but not confirmed speakers, and language can spread without major genetic change. Gothic groups in southern Europe had little eastern Scandinavian ancestry, and Norway shows more continuity across its Viking Age transition, so language change there was not a simple population replacement.

Kroonen’s own field supplies the cross-check. Comparative linguistics offers family trees of the languages, while the genomes offer movements of people, and the study’s claim is that a Baltic-linked arrival about 4,000 years ago fits the linguistic timeline better than older proposals, a fit the authors describe as suggestive rather than conclusive. The unresolved piece is sampling. Few genomes can be recovered from cremation-era periods, which leaves the newcomers’ exact origin uncertain, including how much southern Jutland contributed. Guus Kroonen, a comparative linguist at Leiden and Copenhagen, said ancient DNA gives a new way to test competing theories, and the next round of tests will depend on filling those gaps. Further sampling in Norway, the Baltic and northern Germany, where cremation customs thinned the genetic record, would test whether the 4,000-year-old Baltic link holds, and linguists will want to check the timing against reconstructed vocabulary. For now, the Nature paper offers a candidate answer for where English, German and Scandinavian languages began, and the authors present it as a hypothesis the evidence supports rather than a closed case.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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