The Sainte-Chapelle (; ) is a royal chapel in the Gothic style, within the medieval Palais de la Cité, the residence of the Kings of France until the 14th century, on the Île de la Cité in the River Seine in Paris, France. Construction began sometime after 1238 and the chapel was consecrated on 26 April 1248. The Sainte-Chapelle is considered among the highest achievements of the Rayonnant period of Gothic architecture. It was commissioned by King Louis IX of France to house his collection of Passion relics, including Christ's Crown of Thorns – one of the most important relics in medieval Christendom. This was later held in the nearby Notre-Dame Cathedral until the 2019 fire, which it survived. Along with the Conciergerie, Sainte-Chapelle is one of the earliest surviving buildings of the Capetian royal palace on the Île de la Cité. Although damaged during the French Revolution and restored in the 19th century, it has one of the most extensive 13th-century stained glass collections anywhere in the world. The chapel is now operated as a museum by the French Centre of National Monuments, along with the nearby Conciergerie, the other remaining vestige of the original palace. History Construction of France Sainte-Chapelle was inspired by the earlier Carolingian royal chapels, notably the Palatine Chapel of Charlemagne at his palace in Aix-la-Chapelle (now Aachen). It was built in about 800 and served as the oratory of the Emperor. In 1238 Louis IX had already built one royal chapel, attached to the Château de Saint-Germain-en-Laye. This earlier chapel had only one level; its plan, on a much grander scale, was adapted for Sainte-Chapelle. The two levels of the new chapel, equal in size, had entirely different purposes. The upper level, where the sacred relics were kept, was reserved exclusively for the royal family and their guests. The lower level was used by the courtiers, servants, and soldiers of the palace. It was a very large structure, long, wide, and high, ranking in size with the new Gothic cathedrals in France. In addition to serving as a place of worship, the Sainte-Chapelle played an important role in the political and cultural ambitions of King Louis and his successors. With the imperial throne at Constantinople occupied by a mere Count of Flanders and with the Holy Roman Empire in uneasy disarray, Louis' artistic and architectural patronage helped to position him as the central monarch