Louis IX of France - Religious Nature

Religious Nature

The perception of Louis IX as the exemplary Christian prince was reinforced by his religious zeal. Louis was a devout Catholic, and he built the Sainte-Chapelle ("Holy Chapel"), located within the royal palace complex (now the Paris Hall of Justice), on the Île de la Cité in the centre of Paris. The Sainte Chapelle, a perfect example of the Rayonnant style of Gothic architecture, was erected as a shrine for the Crown of Thorns and a fragment of the True Cross, precious relics of the Passion of Jesus. Louis purchased these in 1239–41 from Emperor Baldwin II of the Latin Empire of Constantinople, for the exorbitant sum of 135,000 livres (the chapel, on the other hand, cost only 60,000 livres to build).

Louis IX took very seriously his mission as "lieutenant of God on Earth", with which he had been invested when he was crowned in Rheims. To fulfill his duty, he conducted two crusades, and even though they were unsuccessful, they contributed to his prestige. Contemporaries would not have understood if the king of France did not lead a crusade to the Holy Land. To finance his first crusade Louis ordered the expulsion of all Jews engaged in usury and the confiscation of their property, for use in his crusade. However, he did not cancel the debts owed by Christians. One-third of the debts was forgiven, but the other two thirds were to be remitted to the royal treasury. Louis also ordered, at the urging of Pope Gregory IX, the burning in Paris in 1243 of some 12,000 manuscript copies of the Talmud and other Jewish books. Legislation against the Talmud in European courts resulted from concerns that its circulation would weaken Christians' faith and threaten the Christian basis of society, the preservation of which was the monarch's duty.

In addition to Louis' legislation against Jews and usury, he expanded the scope of the Inquisition in France. The area most affected by this expansion was southern France where the Cathar heresy had been strongest. The rate of these confiscations reached its highest levels in the years prior to his first crusade, and slowed upon his return to France in 1254.

In all these deeds, Louis IX tried to fulfill the duty of France, which was seen as "the eldest daughter of the Church" (la fille aînée de l'Église), a tradition of protector of the Church going back to the Franks and Charlemagne, who had been crowned by the Pope in Rome in 800. Indeed, the official Latin title of the kings of France was Rex Francorum, i.e. "king of the Franks" (until Louis' grand-father's reign, Philip II whose seal reads Rex Franciae, i.e. "king of France"), and the kings of France were also known by the title "most Christian king" (Rex Christianissimus). The relationship between France and the papacy was at its peak in the 12th and 13th centuries, and most of the crusades were actually called by the popes from French soil. Eventually, in 1309, Pope Clement V even left Rome and relocated to the French city of Avignon, beginning the era known as the Avignon Papacy (or, more disparagingly, the "Babylonian captivity").