From the Wikipedia page [1]
Rouen (French pronunciation: [ʁwɑ̃]; Frankish: Rodomo; Latin: Rotomagus, Rothomagus) is a city on the River Seine in the north of France. It is the capital of the region of Normandy. Formerly one of the largest and most prosperous cities of medieval Europe, Rouen was the seat of the Exchequer of Normandy during the Middle Ages. It was one of the capitals of the Anglo-Norman dynasties, which ruled both England and large parts of modern France from the 11th to the 15th centuries.
The population of the metropolitan area (in French: agglomération) at the 2011 census was 655,013, with the city proper having an estimated population of 111,557. People from Rouen are known as Rouennais.