Aachen is Charlemagne's Aachen. As the heir to the throne, Lothair naturally inherited the imperial capital of his grandfather the Great.
But this city was not built by him. As a brand new "Roman Emperor", it seemed natural to choose a new capital for himself.
There were four important cities in the core area of Frankish rule: Aachen, Paris, Mainz and Strasbourg.
There are many emperor's palaces distributed in the empire, and these cities and palaces can be used as
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