It was founded in 1136 by Louis VI of France. There had previously been a Benedictine monastery in the same place. Amid the ruins, a chapel with important frescos by Primaticcio survives intact. The former abbey is now the location of an art museum, the Musée Jacquemart-André - like the one of the same name in Paris. Like the Paris museum it houses a part of the former collection of artworks of Nélie Jacquemart-André. At her death in 1912 she gave it to the Institut de France and asked that a museum was created in Chaalis, where she had spent her childhood. The museum still presents this very rich collection which features paintings by Giotto, Cima da Conegliano, Luca Signorelli, Francesco Francia, Lorenzo di Credi, Joos van Cleve, Tintoretto, Palma the Younger, Jan Davidsz de Heem, Philip