Task: Text Categorization
Input (English): It reached its summit in its victories over Waldemar IV of Denmark, gaining in the Treaty of Stralsund a virtual monopoly in Scandinavia, but its hegemony was curbed by a Dutch defeat in 1441. The last diet was held in 1669, but this group never formally dissolved. Originating in a treaty between Lbeck and Hamburg in 1241, its goal was to obtain mutual security and exclusive trading rights for its members. FTP, identify this medieval German mercantile league.
Output (English): History