The large rose window with Flamboyant tracery (added to the upper chapel c.1490) dominates the western wall.
La Sainte-Chapelle (French pronunciation: [la sɛ̃t ʃapɛl], The Holy Chapel) is the only surviving building of the Capetianroyal palace on the Île de la Cité in the heart of Paris, France. It was commissioned by King Louis IX of France to house his collection of Passion Relics, including the Crown of Thorns – one of the most important relics in medieval Christendom.