 Whereas the lower windows in the nave arcades and the ambulatory consist of one simple lancet per bay, the clerestory windows are each made up of a pair of lancets with a plate-traceried rose window above.The nave and transept clerestory windows mainly depict saints and Old Testament prophets.Those in the choir depict the kings of France and Castile and members of the local nobility in the straight bays, while the windows in the apse hemicycle show those Old Testament prophets who foresaw the virgin birth, flanking scenes of the Annunciation, Visitation and Nativity in the axial window.