King of France. He/She was born in Poissy in 1215 and died in Tunisia in 1270. Son and successor of Luis VIII and Blanche of Castile. At the age of twelve his father died and, during his minority, his mother, Queen Blanca of Castile exercised the Regency. The uprisings of the great vassals held by Enrique III of England; the continuation of the war against the Albigensians; the assignment of the marquisate of Provence white, invaded Brittany in 1229; the Treaty of Saint-Jean Cormier, which put an end to the civil war in 1231; another Treaty made with Fanon's champagne and Pedro Mauclerc; the marriage of the King with Margarita de Provence in 1234; and the preaching of a new crusade in 1235, were the main events of the minority of Luis IX, which was declared a major in 1236. Educated with the greatest care by her mother, applied to organize the administration of the Kingdom, replacing the arbitrariness with wise and beneficial laws. He/She had to fight many times the rebellions of the great vassals; submitted to the count of la Marche, defeating him in Saintes and Taillebourg; You forgave him in 1242, and granted a truce to Enrique III of England, ally of the count in 1243. Being seriously ill in 1244, he/she did vote to go on pilgrimage to the Holy Land, if he/she recovered health, and in fulfilment of this promise, embarked at Aigues Mortes in 1248; He/She spent the winter in Cyprus, then went to Egypt, and took hold of Damietta in 1249. It took in its March towards Cairo and was defeated the following year at the battle of Mansura, where fell with his two brothers in enemy hands, displaying admirable virtues during their captivity. He/She is rescued by a sum of about 7,000,000 francs to his companions in misfortune, and by its own rescue Damieta restored. He/She then spent four years in Palestine despite claims from his mother, whose death in 1252, was the only reason that could make you go back to France, without removing from his campaign in Palestine more fruit that takes the shot and caesarean section. On its return, the year 1253, he/she continued the work of civilization that had begun; administered justice for himself; published good laws; abolished the judicial fighting; founded the Sorbonne and the three hundred; It gave a decree for the reform of Justice; forbade private wars in 1257; He/She signed the Treaty of Corbeil with Jaime I of Aragon, in 1258, which renounced sovereignty over Catalonia, and the so-called peace of Paris with England in 1259; He/She was elected arbitrator between the barons and the King of England in 1263; It took a second time the cross in 1267; published in 1269 the Pragmatica-sancion; departed for Africa in 1270; It landed in Carthage, which took over, and in front of Tunisia died on August 25 of that year because of the plague, leaving a reputation of greatness, of piety and selflessness, that few Princes have managed. His son Felipe III succeeded him. The collection of laws and decrees of this Prince is known by the name of establishments in San Luis.