Mederic Mieusement: Chateau de St.-Germain-en-laye, Façade exterieur sud, Chapelle. c. 1870, Albumen print from wet collodion negative, 15-1/8 x 11-1/8 in. (385 x 284 mm), on original mount with inkstamp credit and ink title in period hand., At least four figures are visible. Louis IX's chapelle Saint Louis at the castle is a major work of the Rayonnant phase of French Gothic architecture. The Sainte chapelle was built in the 1230's to house a relic of the True Cross or Crown of Thorns. See Wikipedia entry for more. w1814.