Little remains of the abbey's important and influential medieval glazing. The windows of the Rayonnant choir and nave, probably the most important 13th-century ensemble in the Paris region before the glazing of the Sainte-Chapelle, were destroyed in the Revolution. They are documented only in a sketch, one of a series (Compiegne, Mus. Mun. Vivenel) made in 1794-1795 by Charles Percier, and the reliability of even this has been challenged (Lillich). Most of the glass outside of the ambulatory was reconstructed during the 19th century.