Rayonnant was a style of Gothic Architecture which was developed in France in the 13th century. It was the defining style of the High Gothic period, and is often described as the high point of French
Upper level of Sainte-Chapelle, Paris (about 1250)
Rayonnant windows of clerestory and triforium, Early Gothic below
Rayonnant choir, begun in 1236, mainly 1241–1258
The Sainte-Chapelle is a royal chapel in the Gothic style, within the medieval Palais de la Cité, the residence of the Kings of France until the 14th century, on the Île de la Cité in the River Seine
Rayonnant
…reconstruction of the Abbey of Saint-Denis (1231) The first major church built in the new style was Amiens Cathedral (1220–1271). Later examples include Sainte-Chapelle, the royal chapel of King Louis IX of France (1248); the new north and south transepts of Notre Dame de Paris (1250–1270), and the church of Saint-Urbain…
Charter of foundation of the Sainte-Chapelle by Louis IX (1246)
Louis IX receives the crown of thorns and other sacred relics for the Sainte-Chapelle (14th-century illustration)
Illustration in Très Riches Heures du Duc de Berry (c. 15th century; chapel at right)