Emperor  (April 25, 1214 AD～August 25, 1270 AD)

Start End Reign 1226 AD 1270 AD 

　　On the life of Louis IX, most information comes from "Jean de Joinville" book biography "Life of Saint Louis". Joinville was a close friend of Louis IX, a confidant, is also the king's advisor, he also watched in 1297 Pope Boniface VIII, Louis IX for the Saints sealed the Pope trial (the papal inquest into Louis' life that ended with his canonization ). Two other important biographies were the king's confession the priest Geoffey of Beaulieu and affiliated church pastor wrote William of Chartres. The fourth important document is the William of Saint-Pathus autobiography, accounts of the trial in the previous section pope. Louis IX a few years after the death of a biography written by the individual, only Jean of Joinville, Geoffrey of Beaulieu, and William of Chartres wrote from his own will (wrote from personal knowledge of the king).
　　Crusades
　　1250, the then 马穆路克苏丹 it by its officers over the overthrow of the Crusaders, the French to a large ransom redemption Louis IX. It was not until 1254, Louis IX and his soldiers to be released home.
　　1252, in the seventh after the failure of the Crusades, he sent the French Franciscans do not teach Shi Lu Lu begging mission to the Mongol empire, arrived in Harare, the capital of the Mongol Empire and the forest, see Mungo Mungo profusely.
　　St. Louis's reign, the Kingdom of France's political and economic hegemony in Europe, called the "Golden Century St. Louis (golden century of Saint Louis)". King, King of France in Europe and the rulers were seen as "the longest older peers (primus inter pares)". He commanded the largest army in Europe, Governance of Europe's richest countries. At that time France was the center of European art and knowledge, he is considered La Sorbonne (note: may refer to the Sorbonne), founder. In many ways, Louis IX established a "Christian country", but also its still alive and set up their own sacred, just prestige, Louis was elected in a number of occasions arbiter. (On many occasions he was chosen as an arbiter in the quarrels opposing the rulers of Europe.)
　　Missouri, Senegal Saint-Louis du Sénégal, Alsace Saint-Louis, Quebec, St. Louis, Lake, California Mission San Luis Rey de Francia, etc. are to the life of the king to name the word
　　Tunisia Sidi Bou Said to the king, said the French Catholic. Tunisia legend, Louis IX in love with a Berber princess, Louis IX to his name changed Abou Said ibn Khalef ibn Yahia Ettamini el Beji (nickname is Sidi Bou Said), Tunisia, the West Bank town will be strange to this name. According to this legend, Louis IX became saints of Islam, the story is based, while not reliable, but the monarch is clearly particular fanaticism in religion, and Islamic countries with the enemy.