Genomic and strontium isotope variation reveal immigration patterns in a viking age town

Abstract: The impact of human mobility on the northern Euro- pean urban populations during the Viking and Early Middle Ages and its repercussions in Scandinavia it- self are still largely unexplored. Our study of the de- mographics in the final phase of the Viking era is the first comprehensive multidisciplinary investiga- tion that includes genetics, isotopes, archaeology, and osteology on a larger scale. This early Christian dataset is particularly important as the earlier com- mon pagan burial tradition during the Iron Age was cremation, hindering large-scale DNA analyses. We present genome-wide sequence data from 23 indi- viduals from the 10th to 12th century Swedish town of Sigtuna. The data revealed high genetic diversity among the early urban residents. The observed vari- ation exceeds the genetic diversity in distinct mod- ern-day and Iron Age groups of central and northern Europe. Strontium isotope data suggest mixed local and non-local origin of the townspeople..

Genomic and strontium isotope variation reveal immigration patterns in a Viking Age town

The impact of human mobility on the northern European urban populations during the Viking and Early Middle Ages and its repercussions in Scandinavia itself are still largely unexplored. Our study of the demographics in the final phase of the Viking era is the first comprehensive multidisciplinary investigation that includes genetics, isotopes, archaeology, and osteology on a larger scale. This early Christian dataset is particularly important as the earlier common pagan burial tradition during the Iron Age was cremation, hindering large-scale DNA analyses. We present genome-wide sequence data from 23 individuals from the 10th to 12th century Swedish town of Sigtuna. The data revealed high genetic diversity among the early urban residents. The observed variation exceeds the genetic diversity in distinct modern-day and Iron Age groups of central and northern Europe. Strontium isotope data suggest mixed local and non-local origin of the townspeople. Our results uncover the social system underlying the urbanization process of the Viking World of which mobility was an intricate part and was comparable between males and females. The inhabitants of Sigtuna were heterogeneous in their genetic affinities, probably reflecting both close and distant connections through an established network, confirming that early urbanization processes in northern Europe were driven by migration

The genetic history of Scandinavia from the Roman Iron Age to the present

The authors acknowledge support from the National Genomics Infrastructure in Stockholm funded by Science for Life Laboratory, the Knut and Alice Wallenberg Foundation and the Swedish Research Council, and SNIC/Uppsala Multidisciplinary Center for Advanced Computational Science for assistance with massively parallel sequencing and access to the UPPMAX computational infrastructure. We used resources from projects SNIC 2022/23-132, SNIC 2022/22-117, SNIC 2022/23-163, SNIC 2022/22-299, and SNIC 2021-2-17. This research was supported by the Swedish Research Council project ID 2019-00849_VR and ATLAS (Riksbankens Jubileumsfond). Part of the modern dataset was supported by a research grant from Science Foundation Ireland (SFI), grant number 16/RC/3948, and co-funded under the European Regional Development Fund and by FutureNeuro industry partners.Peer reviewedPublisher PD

Population genomics of the Viking world.

The maritime expansion of Scandinavian populations during the Viking Age (about AD 750-1050) was a far-flung transformation in world history1,2. Here we sequenced the genomes of 442 humans from archaeological sites across Europe and Greenland (to a median depth of about 1×) to understand the global influence of this expansion. We find the Viking period involved gene flow into Scandinavia from the south and east. We observe genetic structure within Scandinavia, with diversity hotspots in the south and restricted gene flow within Scandinavia. We find evidence for a major influx of Danish ancestry into England; a Swedish influx into the Baltic; and Norwegian influx into Ireland, Iceland and Greenland. Additionally, we see substantial ancestry from elsewhere in Europe entering Scandinavia during the Viking Age. Our ancient DNA analysis also revealed that a Viking expedition included close family members. By comparing with modern populations, we find that pigmentation-associated loci have undergone strong population differentiation during the past millennium, and trace positively selected loci-including the lactase-persistence allele of LCT and alleles of ANKA that are associated with the immune response-in detail. We conclude that the Viking diaspora was characterized by substantial transregional engagement: distinct populations influenced the genomic makeup of different regions of Europe, and Scandinavia experienced increased contact with the rest of the continent

The Birka Warrior : the material culture of a martial society

This is a study of martial material culture in the context of the Viking Age warrior of Birka, Sweden. The aim is to establish the role, function and affiliation of the Birka warrior and thereby place Birka on the power-political map of the 10th century. The study is based on the excavations of the fortified structures, particularly the Garrison, at the trading post of Birka as well as the extensive remains of material culture deriving from these investigations. A starting hypothesis is that an analysis of material culture constitutes a way of mapping social structures and that style and iconography reflect cultural groups, contacts and loyalties. Based on the case studies of six papers, the synthesis deals with questions of the work and world view of the warriors, as too their relation to their contemporary counterparts in eastern and western Europe. Questions are raised concerning the value and function of symbols in a martial context where material culture reflects rank, status and office. In defining the Birka warrior’s particular stylistic expression, a tool is created and used in the search for contacts and affiliations reflected through the distribution patterns. The results show close contacts with the eastern trading posts located on the rivers Volga and Dnjepr in Ancient Russia. It is stated that these Rus’ trading posts, essentially inhabited by Northmen, shared a common cultural expression that was maintained throughout a vast area by exceptionally close contacts. It is suggested that a particular stylistic expression developed in these Rus’ trading places containing elements of mainly Scandinavian, Steppe nomadic and Byzantine origin. In conclusion, the results of this thesis show that the warriors from Birka’s Garrison had a share in the martial development of contemporary Europe but with their own particular traits. Close relations with the eastern trade route and contact with the powerful Byzantine Empire were enjoyed. As a pointer for future research, it is wondered what organisational form the close-knit structure of the Rus’ trading posts actually took, keeping the subsequent guilds of medieval Europe in mind. The fall of the Garrison, as of Birka, corresponds with the establishment of Christianity in the region. Such changes were not limited to Central Sweden but part of a greater process where a new political structure was developing, better anchored in local concerns