 Inspired by Beauvais and Amiens, he realized original plans in which the windows do not occupy all the available space between the supports and do not have any bracing arches, the ribs directly penetrate under the arch, the choir-rotunda pillars' elliptical plan allows all the light from the apsidal windows to penetrate into the sanctuary, and flying buttresses allow ingenious débords into the nave aisles .Jean worked from 1248 to 1287 on the choir, in which Louis IX came to marry his son (the future Philip III) to Isabella of Aragon.The king financed (maybe for this occasion) part of the stained glass windows that appear to be from the same workshop as those in Sainte-Chapelle.