Yale professor R. Howard Bloch examines the Sainte-Chapelle, consecrated in 1248 under Louis IX, arguing it functioned not as a public cathedral but as a private palace chapel built to house relics. He describes its double structure, a lower chapel for staff and an upper chapel sheathed in stained glass, and inventories the relics it was built to contain, including fragments believed to come from Christ's Passion. Bloch traces how Louis himself became a relic after his death in 1270, his boiled bones and severed head added to the collection by 1298, turning the king into another Saint Denis. The lecture closes on a recurring medieval idea embodied in the building: reliquaries as miniature churches, forms nested within forms. Part of the Yale course The Age of Cathedrals, the talk runs just over twelve minutes and moves through chapters from relics and kingship to Gothic architectural principle.