1226–1270), known to history as "Saint Louis", built the Sainte-Chapelle, a masterpiece of Gothic architecture, especially to house relics from the crucifixion of Christ. Built between 1241 and 1248, it has the oldest stained glass windows preserved in Paris. At the same time that the Saint-Chapelle was built, the great stained glass rose windows, eighteen meters high, were added to the transept of the cathedral.[43]