Four of the ancient Scandinavians from the recent Krzewinska et al. paper on the Viking Age town of Sigtuna made it into my Global25 and North Europe Principal Component Analyses (PCA). Click on the images below to view the hi-res versions of the plots. The relevant datasheets are available here and here. I’ve also updated all of the main Global25 datasheets with these samples. See here and here.
They cover a lot of ground between them, don’t they? Sigtuna_84005 probably has ancestry from what is now Finland, because he’s pulling sharply to the east and overlapping with a western Finn. He also belongs to Y-haplogroup I1a1b3 or I-Z74, which is very common nowadays in western Finland.
The fact that Sigtuna_grt036 is overlapping strongly with Germans suggests that he has ancestry from the southern Baltic region, and indeed his Y-hg I2a2 gels rather nicely with this idea. I don’t know what to make of Sigtuna_grt035’s occidental affinities, but his Y-hg G2a2 is also somewhat unusual for the Baltic region. Interestingly, Sigtuna_stg021 is a female and the only really obvious Scandinavian in this group, but that might be a coincidence.
As far as I know, nothing suggests that any of these males were captives or slaves. So we must assume that they were either migrants or the recent descendants of migrants who settled in Sigtuna for one reason or another, and may even be the ancestors of the Swedes living in the region today.
See also…
Global25 workshop 3: genes vs geography in Northern Europe
Genetic and linguistic structure across space and time in Northern Europe
Modeling genetic ancestry with Davidski: step by step
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