Passage: In the 15th century, Malmö became one of Denmark's largest and most visited cities, reaching a population of approximately 5,000 inhabitants. It became the most important city around the Øresund, with the German Hanseatic League frequenting it as a marketplace, and was notable for its flourishing herring fishery. In 1437, King Eric of Pomerania (King of Denmark from 1396 to 1439) granted the city's arms: argent with a griffin gules, based on Eric's arms from Pomerania. The griffin's head as a symbol of Malmö extended to the entire province of Scania from 1660.

Question: Which group visited Denmark's city?
German Hanseatic League