805 CE

Palatine Chapel At Aachen Completed

About this moment

The Palatine Chapel in Aachen is an early medieval chapel and remaining component of Charlemagne's Palace of Aachen in what is now Germany. Although the palace itself no longer exists, the chapel was preserved and now forms the central part of Aachen Cathedral. It is Aachen's major landmark and a central monument of the Carolingian Renaissance.

Source

Read on Wikipedia