For 10 points, name this
 Northern European trading league established during the late Middle Ages.
This organization was a party to the treaty of Tongsberg, where it resolved a conflict with Eric the
 Priest-Hater. It originally encouraged the privateering activities of the Victual Brothers. At the city of
 Novgorod, this group established a kontor, while a similar post was at the Steelyard in London. As this
 group's power waned, its sphere of influence was limited to its capital, Lubeck. For 10 points, name this
 Northern European trading league established during the late Middle Ages.
This organization was a party to the treaty of Tongsberg, where it resolved a conflict with Eric the
 Priest-Hater.
{Hanseatic} League or {Hansa}