In 1214 a formidable coalition is formed against Philippe Auguste: Jean without Ground, avid of revenge, is combined to the Flemish, Lorraine lords and poitevins which progress of the royalty worries, and with the emperor of Germany, Otton of Brunswick, which wants to dismember France.
But Philippe Auguste, supported by a part of the lords and the communes, deploys a great energy: he gains over the Germans and the rebels the great national victory of Bouvines (1214).
Otton flees, and Jean without Ground is beaten on his side to the Rock-with-Monks in Anjou.
the North of France is pacified, but in the South the appalling war of the Albigensians burst, left crusade directed against the heretics of Languedoc and Provence.
Philippe Auguste does not take share there in person, but it benefits from the defeat of the counts de Toulouse to prepare the meeting of Languedoc to the royal field.
In addition to the provinces removed with the count de Flandre in 1186, and with king d' Angleterre in 1204, Philippe Auguste inherited Artois and confiscated a part of Auvergne.
The royal field, thus increased, is shared into four bailliages subdivided in prévôtés: the baillifs and the provosts are the agents devoted to the king who names them.
From now on the French royalty is enough powerful not to have to fear neither the feudal lords nor the foreign sovereigns.
Finally Philippe Auguste develops industry and the trade, organizes the University, increases, strengthens and embellishes Paris, which becomes the true capital of France.