Seine-Inférieure was the historical name for the area, (known as Seine-Maritime since 1955) and is a department in the Normandy region of France In medieval times, this region was a significant part of the Duchy of Normandy and was home to important cities like Rouen, the traditional capital, and Harfleur, the main port before the creation of Le Havre. The area was rich with historical sites, including abbeys and castles, and its fortunes were tied to major events in English and French medieval history