In the 13th century, the Hanseatic League started to control the majority of the trading through outposts of the North Sea. 
 How important was North Sea back then? 
 Thanks for the interesting information. That's all I need to know. 
 I see. Can you tell me something about its names? 
 HI can you tell me some fact about North Sea?
In the 13th century, the Hanseatic League started to control the majority of the trading through outposts of the North Sea.