A city on the island of Gotland called Visby was part of this group, as was Lubeck.
Two of this group's Kontors were closed by Ivan III. Members of this group fought the Likedeelers or Victual Brothers. Christopher of Bavaria signed the Treaty of Copenhagen with this group, which was expelled from England by Elizabeth I. This organization grew in power by exploiting the Kiel salt road and designed a new flat-bottomed ship called the cog. This union forced Valdemar IV of Denmark to agree to the Peace of Stralsund. A city on the island of Gotland called Visby was part of this group, as was Lubeck. For 10 points, name this medieval Germanic and Scandinavian trading alliance.
Two of this group's Kontors were closed by Ivan III. Members of this group fought the Likedeelers or Victual Brothers.
Hanseatic League [or Hansa]