This is the oldest cathedral in northern Europe and houses a collection of medieval art objects from the late Classical, Carolingian, Ottonian and Staufian periods which are exceptional in their artistic and religious meaning.
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Aachen Cathedral (German: Aachener Dom), traditionally known in English as the Cathedral of Aix-la-Chapelle, is a Roman Catholic church in Aachen, western Germany. It is the oldest cathedral in northern Europe and was constructed by order of the emperor Charlemagne, who was buried there after his death in 814. For 595 years, from 936 to 1531, the Aachen chapel was the church of coronation for thirty German kings and twelve queens. The church has been the mother church of the Diocese of Aachen since 1802. - in: wikipedia