Analysis of human remains from the Viking town of Sigtuna dating to the 900s to the 1100s CE finds that at least half the population consisted of immigrants. Researchers from Stockholm University studied DNA and strontium isotopes from the remains of 38 people to determine where they originated. They found that around half came from the nearby Lake Mälaren area, but the other half came from areas as far off as Ukraine and the British Isles.
Sigtuna, in other words, was the Viking Age equivalent of London or Shanghai today! Sigtuna was one of Sweden’s first cities, founded in 980 by the country’s first Christian king, Olof Skötkonung. It quickly grew and reached a population of 10,000. That’s roughly the same as London at the time. The new discoveries suggest that the city grew partially due to new arrivals, ambitious people interested in working their way up in the world. While Vikings are generally thought of as travelers and adventurers, this suggests they welcomed travelers too.