The Sainte-Chapelle in Paris was originally consecrated as a private royal chapel in 1248 during the reign of King Louis IX of France (r. 1226-1270), who was known in life as rex christianissimus ('most Christian king') and canonized in death as St. Louis. Visually stunning, the chapel is packed with political and religious symbolism to communicate and legitimize the power of Louis IX and the Capetian Dynasty.
This is a companion discussion topic for the original content at https://www.worldhistory.org/article/2069/louis-ix-and-capetian-politics-at-paris-sainte-cha/.