In 1365 , he was appointed drost ( prime minister ) of Denmark .
He showed his diplomatic ability during the war 1367 - 1370 against the powerful Hanseatic League and its allied Confederation of Cologne .
In 1365 , he was appointed drost ( prime minister ) of Denmark , and he showed his diplomatic ability during the war 1367 - 1370 against the powerful Hanseatic League and its allied Confederation of Cologne .