Sainte-Chapelle: Louis IX's Jewel Box Chapel in Paris

The Sainte-Chapelle (“Holy Chapel”) is a royal chapel on the Île de la Cité in Paris, built for King Louis IX between about 1242 and 1248. It was made to house the Crown of Thorns and other relics of Christ’s Passion, and its upper chapel is famous for walls that seem to be made almost entirely of stained glass. It is one of the purest examples of the Rayonnant phase of French Gothic architecture.

Background: a king and his relics

Louis IX, king of France from 1226, was known for his intense piety. In the late 1230s the Latin Empire of Constantinople, created after the sack of Constantinople in 1204, was nearly bankrupt. Its emperor, Baldwin II, had pawned the Crown of Thorns to Venetian creditors.

Louis paid off the debt and acquired the relic, reportedly for about 135,000 livres. In August 1239 he met it near Sens and, barefoot and in a simple tunic, helped carry it in procession. Further relics, including a fragment of the True Cross, arrived in 1241. Louis needed a fitting home for them inside his palace.

Building the chapel

Construction began around 1242 or 1243 within the royal palace on the Île de la Cité. The chapel was consecrated on 26 April 1248, only weeks before the king left on the Seventh Crusade. Its building cost is usually estimated at about 40,000 livres, far less than the price of the relics. The architect is unknown.

The chapel has two levels. The lower chapel, with a low vaulted ceiling painted with fleurs-de-lis, served members of the palace household. The upper chapel, reached from the royal apartments, was reserved for the king, his family and the relics, which were displayed on a raised platform behind the altar.

Walls of glass

The upper chapel is a single tall space whose walls are reduced to slender stone piers. Between them are fifteen windows about 15 metres high, with roughly 600 square metres of glass and more than 1,100 scenes from the Bible, read from bottom to top. They run from Genesis to the Passion, and one window tells the story of the relics’ journey to Paris.

About two-thirds of the glass is original thirteenth-century work. The large west rose window, showing the Apocalypse, was remade around 1490 in the Flamboyant style. Inside, statues of the twelve apostles stand against the piers, and the vaults are painted blue with gold stars.

This style, with thin supports and huge windows, is called Rayonnant, from the radiating patterns of its rose windows. It continued the Gothic experiment begun at Saint-Denis but pushed the dissolving of walls into light to new extremes.

Meaning for Capetian kingship

The relics gave the French monarchy enormous prestige. Holding the Crown of Thorns allowed Louis to present France as a specially chosen Christian kingdom and Paris as a new Jerusalem. The chapel’s decoration links biblical kings with the French monarchy.

Louis was canonised in 1297, and the chapel became a monument to Saint Louis himself. Later kings added treasures and kept the relics as symbols of royal sanctity.

Key people

• Louis IX (1214–1270): king of France from 1226, who acquired the relics and paid for the chapel. He died on crusade at Tunis in 1270.
• Baldwin II (1217–1273): the last Latin emperor of Constantinople, who sold the Crown of Thorns to raise money for his failing empire.
• Blanche of Castile (1188–1252): Louis’s mother, who governed France as regent during his minority and again while he was on crusade.
• The unknown architect: no contemporary record names the master mason. Pierre de Montreuil and Thomas de Cormont have both been suggested, but neither attribution is certain.

The relics and the king’s devotion

Inside the upper chapel, the relics were kept in a great reliquary chest, the Grande Châsse, made of gilded silver and set on a raised tribune behind the altar. On major feasts the king himself would show the Crown of Thorns to the faithful. Pilgrims and foreign rulers came to venerate it, and fragments of thorns were given as precious diplomatic gifts to other churches.

The chapel also had its own college of canons and chaplains, generously endowed by Louis, whose task was to keep up continuous prayer and services before the relics. A treasury next to the chapel held reliquaries, liturgical books and plate.

Later history

During the French Revolution the chapel was secularised, its relics dispersed and parts of its treasury melted down. For a time it stored archives. The Crown of Thorns was given to Notre-Dame de Paris in the early nineteenth century.

A major restoration from the 1840s to the 1860s, by Félix Duban, Jean-Baptiste Lassus and Eugène Viollet-le-Duc, repaired the glass, repainted the interior and added the present spire. The windows were restored again between 2008 and 2015. The chapel now stands within the Palais de Justice complex and is one of the most visited monuments in Paris.

Timeline

• 1226: Louis IX becomes king of France.
• 1239, August: The Crown of Thorns arrives in France.
• 1241: Further Passion relics, including part of the True Cross, arrive.
• c. 1242–1243: Construction begins.
• 1248, 26 April: The Sainte-Chapelle is consecrated.
• 1297: Louis IX is canonised.
• c. 1490: The west rose window is remade.
• 1840s–1860s: Major restoration.

Why it matters

The Sainte-Chapelle shows how architecture, relics and kingship were bound together in medieval Europe. Built as a jewelled shrine for a priceless relic, it is also one of the greatest surviving ensembles of medieval stained glass.