Cologne is the largest city in the German federal State of North Rhine-Westphalia and the fourth-largest city in Germany (after Berlin, Hamburg, and Munich). It is located within the Rhine-Ruhr metropolitan region, one of the major European metropolitan areas, and with more than ten million inhabitants, the largest in Germany. Cologne is about 45 km southwest of North Rhine-Westphalia's capital of Dusseldorf and 25 km northwest of Bonn. 

Cologne is located on both sides of the Rhine, near Germany's borders with Belgium and the Netherlands. 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 and largest universities. 

Cologne was founded and established in Ubii territory in the 1st century AD as the Roman "Colonia Claudia Ara Agrippinensium", from which it gets its name. "Cologne", the French version of the city's name, has become standard in English as well. The city functioned as the capital of the Roman province of "Germania Inferior" and as the headquarters of the Roman military in the region until occupied by the Franks in 462. During the Middle Ages it flourished on one of the most important major trade routes between east and west in Europe. Cologne was one of the leading members of the Hanseatic League and one of the largest cities north of the Alps in medieval and Renaissance times. Prior to World War II the city had undergone several occupations by the French and also by the British (1918–1926). Cologne was one of the most heavily bombed cities in Germany during World War II, with the Royal Air Force (RAF) dropping of bombs on the city. The bombing reduced the population by 95%, mainly due to evacuation, and destroyed almost the entire city. With the intention of restoring as many historic buildings as possible, the successful postwar rebuilding has resulted in a very mixed and unique cityscape.
What does RAF stand for?
In WW II, what was one of the most heavily bombed places in Germany?
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What does it have that's the seat of the Catholic Archbishop of Cologne?
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What is the German name for The University of Cologne?
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Royal Air Force
Royal Air Force (RAF)
Cologne
Cologne was one of the most heavily bombed cities in Germany during World War II
North Rhine-Westphalia
Cologne is the largest city in the German federal State of North Rhine-Westphalia
more than ten million
and with more than ten million inhabitants
in the 1st century AD
Cologne was founded and established in Ubii territory in the 1st century AD
Ubii
Cologne was founded and established in Ubii territory
Colonia Claudia Ara Agrippinensium
the Roman "Colonia Claudia Ara Agrippinensium
Cologne
"Cologne", the French version of the city's name
Germania Inferior
The city functioned as the capital of the Roman province of "Germania Inferior
the Roman military
 and as the headquarters of the Roman military
it was occupied by the Franks
until occupied by the Franks
Cologne
Cologne is the largest city in the German federal State of North Rhine-Westphalia and the fourth-largest city in Germany
the Rhine
Cologne is located on both sides of the Rhine
the Cologne Cathedral
The city's famous Cologne Cathedral ("Kölner Dom") is the seat of the Catholic Archbishop of Cologne
no
The University of Cologne ("Universität zu Köln") is one of Europe's oldest and largest universities. 
Universität zu Köln
 The University of Cologne ("Universität zu Köln")
the Hanseatic League
Cologne was one of the leading members of the Hanseatic League
the French
Prior to World War II the city had undergone several occupations by the French
the British
occupations by the French and also by the British