The Cathedral Basilica of Saint-Denis, a large medieval abbey church in the city of Saint-Denis, now a northern suburb of Paris.
Commemorated to Saint Denis, the first bishop of Paris.
Gothic architecture.
Dagobert 1 (639 AD) was buried there, the monastery quickly became one of the main burial sites for the Merovingian dynasty.
From the time of Hugues Capet (987-996), the basilica was firmly established as the definitive “cemetery of the kings.”
It was not used for the coronations of kings, that function being reserved for the Cathedral of Reims.

Don’t miss some monuments:
Louis XII  and Anne of Brittany, their daughter Claude de France and her husband, François I, Henri II and Catherine de Medicis, Henri IV and Marie de Medicis, Louis XVI and Marie Antoinette.