With the death of Louis VIII (1226), the large feudal lords try to lower the royalty, but the Blanche regent of Castille makes them the war with energy, and imposes treaties to them which devote the triumph of the royalty (1231-1234).
The inhabitants of Languedoc resign themselves to subject themselves; Raymond VII recovers to the hands from his enemies, and the treaty of Paris (1229) puts an end to the war of the Albigensians; the most powerful seigniories of midday are destroyed with the profit of the royalty.
Major in 1236, Louis IX or holy Louis is a really national king: he is firm against the Pope while refusing to strip the emperor of Germany Frederic II (1239), and counters Frederic II by requiring of him the setting in freedom of French bishops (1241).
A league being formed between England, Aragon, the lords of Poitou and Raymond VII, holy Louis convenes the knighthood and advances in Poitou; the king of England is beaten in Taillebourg and Saintes (1242), and signs a truce; the rebels subject themselves.
The catch of Jerusalem by the inaccurate ones (1244) decides holy Louis to take the cross; it embarks with Acute-Dead (1248), joins together its army in Cyprus (1249), unloads in Egypt, seizes Damiette and gains a bloody victory in Mansourah (1250); but crossed, reduced half by the engagements, exhausted by the famine and the diseases, yield to the discouragement in spite of the king and are forced to go.
Louis saint, after having astonished the Moslems by his Christian resignation, pays the ransom of his army, and leaves Egypt (1250); then it goes to Palestine and fights there valiantly during three years.