These residences served as the administrative and spiritual hearts of the Holy Roman Empire.

Palace of Aachen (Germany): The primary residence of Emperor Charlemagne, and where King Bernard of Italy died. It was the "Second Rome" of the North.
Palace of Saint-Denis (France): A residence and the final resting place for King Pepin the Short.
The Imperial Castle of Nuremberg: A key residence for the House of Luxembourg during their time as Holy Roman Emperors.