Cologne came together in 1946 after the Kölner Ballspiel-Club and SpVgg Sülz merged together. They won the first ever Bundesliga title in 1964, one of three German championships in their possession.
In the modern era, they are an up and down club, but Cologne was a major player during the rise of German football. The inaugural Bundesliga champions are one of the most successful clubs in the German Cup, appearing in 10 finals and lifting the trophy four times. Find all of DW's content on Cologne below.
Hoffenheim's first European win, over Basaksehir, was the only positive note on a tough night for Germany's Europa League sides. Cologne suffered another defeat in their long winless run while Hertha Berlin also lost.
As UEFA launched disciplinary proceedings against both clubs after Thursday's fan trouble at the Emirates Stadium, Cologne apologized for some fans' behavior, but also queried decisions from Arsenal and London's police.