1647 Thirty Years' War: Bavaria, Cologne, France and Sweden sign the Truce of Ulm.
1880 Construction of Cologne Cathedral, the most famous landmark in Cologne, Germany, is completed.
1945 Cologne is captured by American Troops.
1964 World War II veteran Walter Seifert runs amok in an elementary school in Cologne, Germany, killing at least eight children and two teachers and seriously injuring several more with a home-made flamethrower and a lance.
1977 Hanns Martin Schleyer, is kidnapped in Cologne, West Germany by the Red Army Faction and is later murdered.
2009 The building of the Historisches Archiv der Stadt Köln (Historical Archives) in Cologne, Germany, collapses.