Sainte-Chapelle, built by Lous IX, was made to house two exremely important relics to the French Royal Family. It has architecture typical of private chapels, but was taken to another level. By using skeletal construction, enormous stained-glass windows were able to be put in, nearly 50 feet tall, and using 6450 sq. feet of stained glass overall. Any remaining stonework was decorated with gold leaf.