|Cologne Cathedral at nighttime|
|Lord Mayor||Jürgen Roters (SPD)|
|Elevation||37 m (121 ft)|
|Population||998,105 (31 December 2009)|
|- Density||2,464 /km2 (6,381 /sq mi)|
|Time zone||CET/CEST (UTC+1/+2)|
|Area codes||0221, 02203 (Porz)|
Cologne is Germany's fourth-largest city (after Berlin, Hamburg and Munich), and is the largest city both in the German Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area, one of the major European metropolitan areas with more than ten million inhabitants. It is one of the oldest cities in Germany, having been founded by the Romans in the year 38 BC. The name is derived from that of the Roman settlement, Colonia Claudia Ara Agrippinensium.
Cologne lies on the River Rhine. The city's famous Cologne Cathedral (Kölner Dom) is the seat of the Catholic Archbishop of Cologne. The University of Cologne (Universität zu Köln) is one of Europe's oldest universities.
Cologne is a major cultural center of the Rhineland and has a vibrant arts scene. Cologne is home to more than 30 museums and hundreds of galleries. Exhibitions range from local ancient Roman archeological sites to contemporary graphics and sculpture. The Cologne Trade Fair hosts a number of trade shows such as Art Cologne, the International Furniture Fair (IMM) and the Photokina.
Within Germany, Cologne is known as an important media center. Several radio and television stations, including Westdeutscher Rundfunk (WDR), RTL and VOX, have their headquarters in the city. Both Pro7 and Sat.1 produce TV shows in Cologne as well. Further, the city hosts the Cologne Comedy Festival, which is considered to be the largest comedy festival in mainland Europe.