Individual Details

Birth

Early Life
Louis was born on 25 April 1214 at Poissy, near Paris, the son of Prince Louis the Lion and Princess Blanche, and baptised in La Collégiale Notre-Dame church. His grandfather was King Philip II of France. He was 9 years old when his grandfather died and his father ascended as Louis VIII. A member of the House of Capet, Louis was twelve years old when his father died on 8 November 1226. He was crowned king within the month at Reims cathedral. Because of Louis's youth, his mother ruled France as regent during his minority.
His younger brother Charles I of Sicily (1227–85) was created count of Anjou, thus founding the second Angevin dynasty.
No date is given for the beginning of Louis's personal rule. His contemporaries viewed his reign as co-rule between the king and his mother, though historians generally view the year 1234 as the year in which Louis began ruling personally, with his mother assuming a more advisory role. She continued as an important counselor to the king until her death in 1252.
On 27 May 1234, Louis married Margaret of Provence (1221 – 21 December 1295), whose sister Eleanor later became the wife of Henry III of England.

Crusading
When he was 15, Louis' mother brought an end to the Albigensian Crusade in 1229 after signing an agreement with Count Raymond VII of Toulouse that cleared the latter's father of wrongdoing. Raymond VI of Toulouse had been suspected of murdering a preacher on a mission to convert the Cathars.
Louis went on two crusades, in his mid-30s in 1248 (Seventh Crusade) and then again in his mid-50s in 1270 (Eighth Crusade).
He had begun with the rapid capture of the port of Damietta in June 1249, an attack which did cause some disruption in the Muslim Ayyubid empire, especially as the current sultan was on his deathbed. But the march from Damietta toward Cairo through the Nile River Delta went slowly. During this time, the Ayyubid sultan died, and a sudden power shift took place, as the sultan's wife Shajar al-Durr set events in motion which were to make her Queen, and eventually place the Egyptian army of the Mamluks in power. On 6 April 1250 Louis lost his army at the Battle of Fariskur and was captured by the Egyptians. His release was eventually negotiated, in return for a ransom of 400,000 livres tournois (at the time France's annual revenue was only about 1,250,000 livres tournois), and the surrender of the city of Damietta.
Following his release from Egyptian captivity, Louis spent four years in the Crusader kingdoms of Acre, Caesarea, and Jaffa. Louis used his wealth to assist the Crusaders in rebuilding their defences and conducting diplomacy with the Islamic powers of Syria and Egypt. Upon his departure from the Middle East, Louis left a significant garrison in the city of Acre for its defence against Islamic attacks. The historic presence of this French garrison in the Middle East was later used as a justification for the French Mandate.
Louis exchanged multiple letters and emissaries with Mongol rulers of the period. During his first crusade in 1248, Louis was approached by envoys from Eljigidei, the Mongol ruler of Armenia and Persia. Eljigidei suggested that King Louis should land in Egypt, while Eljigidei attacked Baghdad, to prevent the Saracens of Egypt and those of Syria from joining forces. Louis sent André de Longjumeau, a Dominican priest, as an emissary to the Great Khan Güyük Khan in Mongolia. However, Güyük died before the emissary arrived at his court, and nothing concrete occurred. Louis dispatched another envoy to the Mongol court, the Franciscan William of Rubruck, who went to visit the Great Khan Möngke Khan in Mongolia.

Patron of arts and arbiter of Europe
Louis' patronage of the arts drove much innovation in Gothic art and architecture, and the style of his court radiated throughout Europe by both the purchase of art objects from Parisian masters for export and by the marriage of the king's daughters and female relatives to foreign husbands and their subsequent introduction of Parisian models elsewhere. Louis' personal chapel, the Sainte-Chapelle in Paris, was copied more than once by his descendants elsewhere. Louis most likely ordered the production of the Morgan Bible, a masterpiece of mediaeval painting.
Saint Louis ruled during the so-called "golden century of Saint Louis", when the kingdom of France was at its height in Europe, both politically and economically. The king of France was regarded as a primus inter pares among the kings and rulers of the continent. He commanded the largest army, and ruled the largest and most wealthy kingdom of Europe, a kingdom which was the European centre of arts and intellectual thought (La Sorbonne) at the time. The prestige and respect felt in Europe for King Louis IX was due more to the attraction that his benevolent personality created rather than to military domination. For his contemporaries, he was the quintessential example of the Christian prince, and embodied the whole of Christendom in his person. His reputation of saintliness and fairness was already well established while he was alive, and on many occasions he was chosen as an arbiter in the quarrels opposing the rulers of Europe.
Shortly before 1256 Enguerrand IV of Coucy arrested and without trial hanged three young squires of Laon whom he accused of poaching in his forest. In 1256 Louis had him arrested and brought to the Louvre by his sergeants. Enguerrand demanded judgment by his peers and trial by battle which was refused by the king because Louis thought it obsolete. Enguerrand was tried, sentenced and ordered to pay 12,000 livres. Part of the money was to pay for masses in perpetuity for the men he had hanged.
In 1258, Louis and James I of Aragon signed the Treaty of Corbeil, under which Louis renounced his feudal overlordship over the County of Barcelona, which was held by the King of Aragon. James in turn renounced his feudal overlordship over several counties in southern France.

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 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").

Marriage

On 27 May 1234 at the age of thirteen, Margaret became the queen consort of France and wife of Louis IX of France, by whom she had eleven children. She was crowned on the following day.
Margaret, like her sisters, was noted for her beauty, she was said to be "pretty with dark hair and fine eyes",[4] and in the early years of their marriage she and Louis enjoyed a warm relationship. Her Franciscan confessor, William de St. Pathus, related that on cold nights Margaret would place a robe around Louis' shoulders, when her deeply religious husband rose to pray. Another anecdote recorded by St. Pathus related that Margaret felt that Louis' plain clothing was unbecoming to his royal dignity, to which Louis replied that he would dress as she wished, if she dressed as he wished.

During the Seventh Crusade
Margaret accompanied Louis on his first crusade and was responsible for negotiations and ransom when he was captured. She was thus for a brief time the only woman ever to lead a crusade. During this period, while in Damietta, she gave birth to her son Jean Tristan.
The chronicler Joinville, who was not a priest, reports incidents demonstrating Margaret's bravery after Louis was made prisoner in Egypt: she decisively acted to assure a food supply for the Christians in Damietta, and went so far as to ask the knight who guarded her bedchamber to kill her and her newborn son if the city should fall to the Arabs. Joinville also recounts incidents that demonstrate Margaret's good humor, as on one occasion when Joinville sent her some fine cloth and, when the queen saw his messenger arrive carrying them, she mistakenly knelt down thinking that he was bringing her holy relics. When she realized her mistake, she burst into laughter and ordered the messenger, "Tell your master evil days await him, for he has made me kneel to his camelines!"
However, Joinville also remarked with noticeable disapproval that Louis rarely asked after his wife and children. In a moment of extreme danger during a terrible storm on the sea voyage back to France from the Crusade, Margaret begged Joinville to do something to help; he told her to pray for deliverance, and to vow that when they reached France she would go on a pilgrimage and offer a golden ship with images of the king, herself and her children in thanks for their escape from the storm. Margaret could only reply that she dared not make such a vow without the king's permission, because when he discovered that she had done so, he would never let her make the pilgrimage. In the end, Joinville promised her that if she made the vow he would make the pilgrimage for her, and when they reached France he did so.

Political significance
The Treaty of Paris came about since the relationship between Louis and Henry III of England had improved, since both they and their younger brothers had married the four sisters from Provence. Margaret was present during the negotiations, along with all her sisters and her mother.
In later years Louis became vexed with Margaret's ambition. It seems that when it came to politics or diplomacy she was indeed ambitious, but somewhat inept. An English envoy at Paris in the 1250s reported to England, evidently in some disgust, that "the queen of France is tedious in word and deed," and it is clear from the envoy's report of his conversation with the queen that she was trying to create an opportunity for herself to engage in affairs of state even though the envoy was not impressed with her efforts. After the death of her eldest son Louis in 1260, Margaret induced the next son, Philip, to swear an oath that no matter at what age he succeeded to the throne, he would remain under her tutelage until the age of thirty. When Louis found out about the oath, he immediately asked the pope to excuse Philip from the vow on the grounds that he himself had not authorized it, and the pope immediately obliged, ending Margaret's attempt to make herself a second Blanche of Castile. Margaret subsequently failed as well to influence her nephew Edward I of England to avoid a marriage project for one of his daughters that would promote the interests in her native Provence of her brother-in-law, Charles of Anjou, who had married her youngest sister Beatrice.

Burial

Death and legacy
During his second crusade, Louis died at Tunis, 25 August 1270. As Tunis was Muslim territory, his body was subject to the process known as mos Teutonicus (a postmortem funerary custom used in mediæval Europe whereby the flesh was boiled from the body, so that the bones of the deceased could be transported hygienically from distant lands back home.) for its transportation back to France. He was succeeded by his son, Philip III. Louis was traditionally believed to have died from the bubonic plague but the cause is thought by modern scholars to have been dysentery. The bubonic plague did not strike Europe until 1348, so the likelihood of his contracting and ultimately dying from the bubonic plague was very slim.
Christian tradition states that some of his entrails were buried directly on the spot in Tunisia, where a Tomb of Saint-Louis can still be visited today, whereas his heart and other parts of his entrails were sealed in an urn and placed in the Basilica of Monreale, Palermo, where they still remain. (Sicily was at that time ruled by his younger brother, Charles of Anjou, and the French army returned to France through the Kingdom of Naples and Sicily.) His corpse was taken, after a short stay at the Basilica of Saint Dominic in Bologna, to the French royal necropolis at Saint-Denis, resting in Lyon on the way. His tomb at Saint-Denis was a magnificent gilt brass monument designed in the late 14th century. It was melted down during the French Wars of Religion, at which time the body of the king disappeared. Only one finger was rescued and is kept at Saint-Denis.

Veneration as a saint
Pope Boniface VIII proclaimed the canonization of Louis in 1297; he is the only French monarch to be declared a saint.
Louis IX is often considered the model of the ideal Christian monarch. Because of the aura of holiness attached to his memory, many kings of France were called Louis, especially in the Bourbon dynasty, which directly descended from one of his younger sons.
The Congregation of the Sisters of Saint Louis is a Roman Catholic religious order founded in 1842 and named in his honor.
He is also honored as co-patron of the Third Order of St. Francis, which claims him as a member of the Order.