- Purpose: Built in 1248 by King Louis IX (later Saint Louis), Sainte-Chapelle was a royal chapel that housed sacred Christian relics, including the Crown of Thorns and pieces of the True Cross.
- Architecture: It is a masterpiece of Gothic architecture, known for its stunning stained glass windows covering nearly 75% of the upper chapel's surface. These windows depict over 1,100 biblical scenes, making it one of Europe's most remarkable examples of medieval artistry.
- Function: The royal family primarily used the chapel for worship and as a showcase for their piety and wealth. Its creation was also intended to affirm the divine right of kings and Louis IX's sanctity.
- Modern use: Today, Sainte-Chapelle is a popular tourist attraction and a unique venue for classical music concerts.