Mont-Saint-Aignan is a commune in the Seine-Maritime department in the region of Normandy, northwestern France.

Rouen is a city on the River Seine in northern France. It is the prefecture of the region of Normandy and the department of Seine-Maritime. Formerly one of the largest and most prosperous cities of medieval Europe, the population of the metropolitan area is 702,945 (2018). People from Rouen are known as Rouennais.