The Rose Window of Sainte-Chapelle is one of the most iconic features of the chapel and a masterpiece of Gothic architecture and stained glass art. Located at the east end of the chapel, it is a large, circular window, measuring about 13 feet (4 meters) in diameter, and is considered one of the most important examples of flamboyant Gothic architecture, characterized by its elaborate stonework and window tracery, rose window. It was aligned with the placement of the holy relics (such as the Crown of Thorns), reinforcing the sacred purpose of the chapel as a space that connects the earthly with the heavenly.