Not much mixing in Scandinavia with Europe in centuries before Viking Age. Lot of mixing with Balts in Gotland & British-Irish in S Sweden/Denmark during Viking Age, but they contribute considerably less ancestry to modern Scandinavians today. sciencedirect.com
Could be due to immigrants/thralls having lower social status and thus being poorer and having fewer surviving children, or could be due to cosmopolitan types having lower fertility.
One find is a British Isles woman in Viking Age central Sweden. Another appears to be a woman of mostly Briton ancestry brought to Denmark by Anglo-Saxons during 5th century AD. The Saxons are known to have kept in contact with their far-away coethnics.
Some Scandinavian men in eastern Sweden in 3rd-6th centuries AD carried Uralic patrilines despite having very little Uralic autosomal DNA. One contemporary woman from 5th century AD northern Sweden has a tiny amount of detectable Uralic ancestry.
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