This 11th-century Romanesque-Gothic basilica honors the fifth-century saint who gave his name to the city and baptized Clovis (the first king of France) in 498. The interior seems to stretch into the endless distance, an impression created by its relative murk and lowness. The airy four-story Gothic choir contains some fine stained glass from the 12th century. The holy phial used in the crowning of monarchs was formerly kept alongside the basilica in the Abbaye Royale;
today that building houses an interesting museum which highlights the history of the abbey, the Gallo-Roman history of the town, and the military history of the region.