that the original colours were much brighter than those favoured by the 19th-century restorers and would have been closer to the colours of the stained glass. The quatrefoils of the dado arcade were painted with scenes of saints and martyrs and inset with painted and gilded glass, emulating Limoges enamels, while rich textiles hangings added to the richness of the interior. The most striking aspect and original feature of the plan is the nearly total absence of masonry walls in the upper chapel. The walls are replaced by pillars and buttresses, and the space between is almost entirely glass, filling the upper chapel with light. Lower Chapel The lower chapel was dedicated to the Virgin Mary, and was used by the non-royal inhabitants of the neighbouring Royal Palace. The portal of the chapel represents the Virgin Mary as a column statue. The portal, and almost all the decoration of the chapel, was created by Geoffroy-Duchaume between 1854 and 1858. The primary decorative themes of the sculpture, columns and murals are the Fleur-de-Lys emblem of Louis IX and a stylised castle, the coat of arms of Blanche of Castile, the mother of Louis IX. The lower chapel is only high, with a six-meter wide central vessel and two narrow side aisles. The supports of the ceiling vaults are unusual; the outward thrust of the vaults is counterbalanced by small, elegant arched buttresses between the outer and inner columns, and they are also reinforced by a metallic structure hidden under the paint and plaster. The one-hundred forty capitals of the columns are an important decorative feature; they are from the mid-13th century, and predate the columns of the upper chapel. They have floral decoration of acanthus leaves typical of the period. Each of the gilded leaves corresponds with a slender colonette above, which rises upward to support the vaults. The columns are painted with alternating floral designs and the castle emblem of Castile. The red, gold and blue painting dates to the 19th century restoration. The original stained glass of the lower chapel was destroyed by a flood in 1690; it was replaced by colourless glass. The present glass depicts scenes from the life Virgin Mary, surrounded by grisaille glass, while the apse has more elaborate and colourful scenes from the Virgin's life. All the windows were designed by Steinheil during the 19th century restoration. The lower chapel originally had a doorway