18 July 2025 The Future is the Product of the Past

New study investigates the development of the Scandinavian gene pool over the latest 2000 years

A new study resolves the complex relations between geography, ancestry, and gene flow in Scandinavia – encompassing the Roman Age, the Viking Age, and later periods.

Researchers investigated a 2,000-year genetic transect through Scandinavia spanning the Iron Age to the present, based on 48 new and 249 published ancient genomes and genotypes from 16,638 modern individuals.

A surprising increase of variation during the Viking period indicates that gene flow into Scandinavia was especially intense during this period.

An international study coordinated from Stockholm and Reykjavik investigates the development of the Scandinavian gene pool over the latest 2000 years. In this effort the scientists relied on historic and prehistoric genomes, and from material excavated in Scandinavia. These ancient genomes were compared with genomic data from 16,638 contemporary Scandinavians. As the geographical origin and the datings were known for all these individuals, it was possible to resolve the development of the gene pool to a level never realised previously.

Archaeological excavation at Sandby Borg. Photo: Daniel Lindskog
Archaeological excavation at Sandby Borg. Photo: Daniel Lindskog

Dr Ricardo Rodríguez Varela at the Centre for Palaeogenetics*, who analyzed all the data and extracted some of the ancient DNA used in the study, explains: “With this level of resolution we not only confirm the Viking Age migration. We are also able to trace it to the east Baltic region, the British-Irish Isles and southern Europe. But not all parts of Scandinavia received the same amounts of gene flow from these areas. For example, while British-Irish ancestry became widespread in Scandinavia the eastern-Baltic ancestry mainly reached Gotland and central Sweden.”

The gene pool bounced back after the Viking period

Another new discovery in this study was what happened to the gene pool after the Viking period. The scientists were surprised to find that it bounced back in the direction of what it looked like before the Viking period migration.

Professor Anders Götherström at the Centre for Palaeogenetics, who is a senior scientist on the study, is intrigued: “Interestingly, the non-local ancestry peaks during the Viking period while being lower before and after. The drop in current levels of external ancestry suggests that the Viking-period migrants got less children, or somehow contributed proportionally less to the gene pool than the people who were already in Scandinavia.”

Yet a new discovery was the history of the northern Scandinavian gene pool. There is a genetic component in northern Scandinavia that is rare in central and western Europe, and the scientists were able to track this component in northern Scandinavia through the latest 1000 years.

Underwater excavations of the ship Kronan. Photo: Lars Einarsson.
Underwater excavations of the ship Kronan. Photo: Lars Einarsson.

Dr Ricardo Rodríguez Varela comments, “We suspected that there was a chronology to the northern Scandinavian gene pool, and it did indeed prove that a more recent influx of Uralic ancestry into Scandinavia define much of the northern gene pool. But if it is recent, it is comparatively so. For example, we know that this Uralic ancestry was present in northern Scandinavia as early as during the late Viking period”.

Based on well-known Swedish archaeological sites

The study is based on a number of well-known Swedish archaeological sites. For example, there are genomes from the 17th century warship Kronan, from the Viking and Vendel period boat burials in the lake Mälaren Valley, and from the migration period ring fortress Sandby borg on Öland.

Anders Götherström conclude: “We were working on a number of smaller studies on different archaeological sites. And at some point it just made sense to combine them into a larger study on the development of the Scandinavian gene pool.

The study, published today in Cell, is an international effort with several collaborators, but it was led by Dr Ricardo Rodríguez Varela and Professor Anders Götherstörm at Stockholm University, and Professor Agnar Helgason, and Kristjáan Moore at deCODE in Reykavijk.

The article “The genetic history of Scandinavia from the Roman Iron Age to the present” is published in Cell.

10.1016/j.cell.2022.11.024

Cover Photo: Sandby borg archaeological excavations. DANIEL LINDSKOG

Related Articles

A rare Pictish stone was found near the potential site of the famous Scottish battle that led to the creation of Scotland

7 March 2022

7 March 2022

A team of archaeologists has discovered a Pictish symbol stone close to the site of what is thought to have...

A massive Rune stone found under a kitchen floor in Denmark declared treasure

8 June 2023

8 June 2023

A couple in Denmark discovered a massive rune stone weighing approximately 900 kilograms during a home renovation project that planned...

Gold coin hoard discovered in a cup beneath a North Yorkshire kitchen floor is being auctioned off

7 September 2022

7 September 2022

A couple in North Yorkshire found an early 18th-century gold coin hoard buried under the floorboards of their kitchen. The...

New discoveries in Göbeklitepe and Karahantepe: A Human statue with a realistic facial expression found in Karahantepe

30 September 2023

30 September 2023

New finds were discovered in Göbeklitepe and Karahantepe. At around 12,000 years old, Göbekli Tepe is the world’s oldest megalithic...

Climate has influenced the growth of our bodies and our brain

8 July 2021

8 July 2021

Over 300 fossils from the genus Homo have been measured for body and brain size by an interdisciplinary team of...

Persian-era plaster walls were discovered during excavations at Zeyve Höyük in central Turkey

2 August 2022

2 August 2022

This year’s excavations at Porsuk-Zeyve Höyük (Zeyve Mound) near the Porsuk village of the Ulukışla district of Niğde, located in...

The Lord’s Prayer Carved in Stone with Scandinavian Runes and a Picture of a Boat Discovered in Ontario, Canada

17 June 2025

17 June 2025

Hidden deep in the northern Ontario wilderness, an extraordinary archeological discovery has puzzled researchers and captured the imagination of history...

200,000-year-old ‘mammoth graveyard’ found in the southwest UK

19 December 2021

19 December 2021

Researchers have unearthed a mammoth “graveyard” filled with the bony remains of five individuals, including an infant, two juveniles, and...

Viking Tomb Discovery in Denmark May Reveal Elite Family Linked to King Harald Bluetooth

20 June 2025

20 June 2025

A stunning archaeological discovery near Aarhus, Denmark, has revealed 30 Viking Age graves that may belong to a powerful aristocratic...

Unprecedented necropolis site found in Cappadocia, one of Türkiye’s most important tourism centers

8 July 2024

8 July 2024

In Cappadocia, located in the Central Anatolia Region of Türkiye, known for its unique moon-like landscape, underground cities, cave churches,...

Centuries-old boardwalk discovered

22 December 2023

22 December 2023

During construction work in November 2023, road construction workers in Fürth came across an archaeological sensation: a centuries-old boardwalk under...

Are the skeletons found in the restoration of the Bukoleon Palace the victims of the Crusader army massacre in Constantinople?

29 November 2021

29 November 2021

It is thought that the 7 skeletons messy found in the Bukoleon Palace excavations may be the victims of the...

4000-year-old Palace complex dating from China’s earliest known Xia dynasty unearthed

30 December 2023

30 December 2023

In Xinmi, in the Henan Province of Central China, a four-courtyard style palace complex from the Xia Dynasty (2070BC–1600BC), China’s...

Israeli researchers uncover earliest evidence silver used as currency in Levant

9 January 2023

9 January 2023

On Sunday, Israeli archaeologists revealed that they had found the earliest proof of silver being used as money in the...

A Polish-Croatian team discovered Ancient Roman Temple under a Croatian 18th Century church

24 November 2022

24 November 2022

Under an 18th-century church, the Church of St. Daniel in Danilo near Sibenik, Croatia, the foundations of an ancient Roman...