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During the Middle Ages the city flourished as being located on one of the most important major trade routes between eastern and western Europe (including the Brabant Road and the Via Regia and Publica). Cologne was a free imperial city of the Holy Roman Empire and one of the major members of the trade union Hanseatic League. It was one of the largest European cities in medieval and renaissance times....Cologne was one of the most heavily bombed cities in Germany during World War II.The bombing reduced the population by 93% mainly due to evacuation and destroyed around 80% of the millennia-old city center
