Gottingen was in the Hanseatic League... the town hall building still has a mural painted around the top of the walls depicting Hanseatic League cities. I saw it when I was visiting a friend there so it was actually the first one I typed in. Google says they joined in 1351.
As Wikipedia says it, Gottingen and Hamelin only had Hansa comminuties. I didnt add those cities because I think that might make the quiz too long because some of the towns are pretty obscure.
https://en.wikipedia.org/wiki/Hanseatic_League#Lists_of_former_Hansa_cities