Louis I of Flanders was a notable medieval ruler who reigned from 1346 to 1384. He was the son of Louis II of Flanders and Margaret III of Flanders. His rule was marked by efforts to strengthen the economy and maintain peace in the region, which was crucial during a time of political instability in Europe. During his reign, Louis I focused on developing trade and commerce, particularly in the prosperous cities of Bruges and Ghent. He also played a significant role in the Hundred Years' War, navigating complex alliances and conflicts that affected Flanders and its surrounding territories.