Final answer:
King Louis IX commissioned Sainte-Chapelle to house his collection of Passion Relics, including the Crown of Thorns and fragments of the True Cross.
Explanation:
Sainte-Chapelle was commissioned by King Louis IX of France to house his collection of Passion Relics, which included significant religious artifacts like the Crown of Thorns and fragments of the True Cross. These relics were acquired by Louis IX in the 13th century, and the chapel was built specifically to safeguard and honor these sacred items. The chapel's design, with niches for the king and queen and a reliquary at the far end, emphasized the central role of the relics within Sainte-Chapelle.
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