Which cathedral in Aachen contains the octagonal Palatine Chapel built for Charlemagne?

Aachen Cathedral contains the octagonal Palatine Chapel built for Charlemagne.

The Palatine Chapel formed the core of Charlemagne’s palace complex at Aachen and was consecrated around 805. Its centralized octagonal design was influenced by late Roman and Byzantine architecture, especially the church of San Vitale in Ravenna. The chapel later became the heart of Aachen Cathedral.

Charlemagne was buried there in 814, and the cathedral became an important destination for pilgrimage and imperial ceremony. From 936 until 1531, German kings were crowned at Aachen, although the coronation ceremony also involved other locations and institutions in the city.

Aachen Cathedral was among the first monuments in Germany to receive UNESCO World Heritage status, in 1978. The medieval cathedral now surrounds the original chapel with later additions, so the complex displays architectural changes spanning many centuries.