I recently looked at this painting, Valdemar Atterdag brandskattar Visby den 27 juli 1361, from 1882. This depicts Valdemar Atterdag (Valdemar IV of Denmark) forcefully ordering tribute from Visby, a Hanseatic town in Gotland, Sweden, Notice how there's a jewish merchant wearing a judenhut in the right, next to a child and a Teutonic knight. Now, the fact that this image depicts a jew doesn't necessarily mean there were jews in Gotland (there certainly were jews in Gotland however, just not for this reason), considering that this image was made 500 years after this event happened. Here's my question however: Why would this be added to the detail if the Baltic ports were free of jews, including jewish merchants? The painter, Carl Gustaf Hellqvist had to have been aware in some way that there were jews in the Hanseatic ports back in 1361. Of course, there were, but modern jews always try to downplay it to hide their influence, but some Israeli sites like Haaretz seem to have forgot to be sensitive about hiding their influence:>By the 14th century, Cologne’s renewed Jewish population played an important role in the economy of this important trading center and member of the Hanseatic League. They had exclusive permission to make interest-based loans, and their clients included not only merchants but also the city itself. (Visitors to Cologne today can still see the “Judenprivileg” carved into a wall at Cologne Cathedral, the rules set down by Archbishop Engelbert II von Falkenberg regulating the Jewish role in moneylending.)
Cologne was located on the Rhine, but it was trading with the Hanseatic states in the Baltic; the jewish community of Cologne date back to 321 AD, when Constantine called them to the Decurionate.https://sourcebooks.fordham.edu/source/300-800-laws-jews.asp>With certain exceptions Jews are to be called to the Decurionate.
Since the jews of Cologne actually weren't affected by the "Rhineland massacres", this would've meant that the jews of Cologne were still around when the Hanseatic league was established, and thus traded in the Baltic. However, this wasn't the beginning of jewish involvement in Scandinavia. In the 8th century (preceding Christianisation), one of the most prominent Danish cities was Hedeby near the river Trenen, now located in Schleswig, Germany. It traded with tribes in the Baltic including Prussia (which was later conquered and massacred by the Teutonic knights), the previously mentioned Gotland, and even Estonia alongside Anglo-Saxon England. Its main descriptors are Wulfstan (an Anglo-Saxon) and Ibrahim ibn Yaqub. The latter was actually a jew from Moorish Spain; Abraham ben Jacob in Hebrew. He was a traveller, and likely also either a merchant, diplomat, or even a spy (which puts to fruition the ancient equivalent of the Mossad, or jews in other agencies). >Slesvig (Hedeby) is a very large town at the extreme end of the world ocean… The inhabitants worship Sirius, except for a minority of Christians who have a church of their own there…. He who slaughters a sacrificial animal puts up poles at the door to his courtyard and impales the animal on them, be it a piece of cattle, a ram, billy goat or a pig so that his neighbours will be aware that he is making a sacrifice in honour of his god. The town is poor in goods and riches. People eat mainly fish which exist in abundance. Babies are thrown into the sea for reasons of economy. The right to divorce belongs to the women…. Artificial eye make-up is another peculiarity; when they wear it their beauty never disappears, indeed it is enhanced in both men and women. Further: Never did I hear singing fouler than that of these people, it is a rumbling emanating from their throats, similar to that of a dog but even more bestial
He speaks in disdain of the city further into the text (calling their singing "like that of a dog but more bestial"), and is probably not the most accurate. For example, he literally states that "babies are thrown in the sea for reasons of economy". Come on, do you really believe that the people of Hedeby threw babies into the sea for "reasons of economy", in a small settlement at that? Even contemporary Christian descriptions of the Norsemen aren't as vile as what this jew describes Hedeby as: the closest thing to what Ibn Yaqub says is Ibn Fadlan's description, and even then, he at least partially compliments them. So his comments and potential lie can be seen as another example of jewish disdain for Europeans, just in the early middle ages.
Thus, here we have some more examples of jews in medieval Scandinavia.