Founded in 990 by the wife of Hugh Capet to house the relics of a recluse from Bas-Maine, Saint Fraimbault or Frambourg. The high church has a single Gothic nave. In the archaeological crypt, the remnants of a sanctuary dating back to the year 1 000 have been uncovered. Restored in 1977 thanks to pianist Georges Cziffra, the chapel has been turned into the Franz Liszt Auditorium, which hosts concerts and exhibitions organised by the Cziffra Foundation. See the exceptional series of stained-glass windows by Joan Miró.