Aachen: why the octagonal chapel is at the center of the story

Useful to know

To understand the cathedral in Aachen, start from the palace chapel, built approximately between 790 and 800 under Charlemagne. Its octagonal core and dome place emphasis on the centrally organized space. Today's complex also includes later medieval extensions. [1]

When considering a plan, separate the early core from the added parts. This allows you to see how a strong geometric shape remains recognizable even as the building changes. The central plan directs the view differently from the long successive ship of a basilica.

The architectural reading here is about the relationship between form and representativeness. It is not necessary to attribute every part of the modern cathedral to a single construction period. It is more useful to trace what was the original spatial center and how subsequent generations built around it.