Blanche of Castile in the context of "Charles I of Naples"

Stained glass refers to coloured glass as a material or art and architectural works created from it. Although it is traditionally made in flat panels and used as windows, the creations of modern stained glass artists also include three-dimensional structures and sculpture. Modern vernacular usage has often extended the term "stained glass" to include domestic lead light and objets d'art created from glasswork, for example in the famous lamps of Louis Comfort Tiffany.

As a material stained glass is glass that has been coloured by adding metallic salts during its manufacture. It may then be further decorated in various ways. The coloured glass may be crafted into a stained-glass window, say, in which small pieces of glass are arranged to form patterns or pictures, held together (traditionally) by strips of lead, called cames or calms, and supported by a rigid frame. Painted details and yellow-coloured silver stain are often used to enhance the design. The term stained glass is also applied to enamelled glass in which the colors have been painted onto the glass and then fused to the glass in a kiln.

Louis IX (25 April 1214 – 25 August 1270), also known as Saint Louis, was King of France from 1226 until his death in 1270. He is widely recognized as the most distinguished of the Direct Capetians. Following the death of his father, Louis VIII, he was crowned in Reims at the age of 12. His mother, Blanche of Castile, effectively ruled the kingdom as regent until he came of age, and continued to serve as his trusted adviser until her death. During his formative years, Blanche successfully confronted rebellious vassals and championed the Capetian cause in the Albigensian Crusade, which had been ongoing for the past two decades.

As an adult, Louis IX grappled with persistent conflicts involving some of the most influential nobles in his kingdom, including Hugh X of Lusignan and Peter I of Brittany. Concurrently, England's Henry III sought to reclaim the Angevin continental holdings, only to be decisively defeated at the Battle of Taillebourg. Louis expanded his territory by annexing several provinces, including parts of Aquitaine, Maine, and Provence. Keeping a promise he made while praying for recovery from a grave illness, Louis led the ill-fated Seventh and Eighth Crusades against the Muslim dynasties that controlled North Africa, Egypt, and the Holy Land. He was captured and ransomed during the Seventh Crusade, and later succumbed to dysentery during the Eighth Crusade. His son, Philip III, succeeded him.

Stained glass refers to coloured glass as a material or art and architectural works created from it. Although it is traditionally made in flat panels and used as windows, the creations of modern stained glass artists also include three-dimensional structures and sculpture. Modern vernacular usage has often extended the term "stained glass" to include domestic lead light and objets d'art created from glasswork, for example in the famous lamps of Louis Comfort Tiffany.

As a material stained glass is glass that has been coloured by adding metallic salts during its manufacture. It may then be further decorated in various ways. The coloured glass may be crafted into a stained-glass window, in which small pieces of glass are arranged to form patterns or pictures, held together (traditionally) by strips of lead, called cames or calms, and supported by a rigid frame. Painted details and yellow-coloured silver stain are often used to enhance the design. The term stained glass is also applied to enamelled glass in which the colors have been painted onto the glass and then fused to the glass in a kiln.

The accession of the king of France to the royal throne was legitimized by a ceremony performed with the Crown of Charlemagne at the Reims Cathedral. In late medieval and early modern times, the new king did not need to be anointed in order to be recognized as French monarch but ascended upon the previous monarch's death with the proclamation "Le Roi est mort, vive le Roi!"

The most important part of the French ceremony was not the coronation itself, but the Sacre – the anointing or unction of the king. The Carolingian king Pepin the Short was anointed in Soissons (752) to legitimize the accession of the new dynasty. A second anointing of Pepin by Pope Stephen II took place at the Basilica of Saint-Denis in 754, the first to be performed by a pope. The unction served as a reminder of the baptism of king Clovis I in Reims by archbishop Saint Remi in 496/499, where the ceremony was finally transferred in 816 and completed with the use of the Holy Ampulla found in 869 in the grave of the Saint. Since this Roman glass vial containing the balm due to be mixed with chrism, was allegedly brought by the dove of the Holy Spirit, the French monarchs claimed to receive their power by divine right. Out of respect for the miraculous oil, the king's shirt and the gloves put on after the unction of the hands were burned after the ceremony. Exceptionally, the shirt worn by Louis XV was not burned. The shirt was donated to the king of Portugal, John V, and is today at the National Palace of Mafra, guarded by the Royal and Venerable Confraternity of the Most Blessed Sacrament of Mafra.