Aachen, also known as Aix-la-Chapelle, is the German capital in Civilization VI (under Frederick Barbarossa), the Holy Roman capital in Civilization IV: Beyond the Sword, and a German city in other games. In real life, it is the westernmost city in present-day Germany and the site of 31 Holy Roman Emperors' coronations.
In scenarios, it may appear as the Burgundian capital in Middle Ages and the Frankish capital in Vikings, Traders, and Raiders!.