Which of the kings of France played the most important role in the struggle for the unification of France?

The greatest role in the unification of France was played by King Philip 2. He was able to recapture the lands of Normandy from the British and annex the County of Toulouse. During the reign of Philip 4 the Handsome, the lands of Flanders, Navarre and Champagne were temporarily annexed to France. At that time, France was fighting the Pope. So in 1302, the States General were first convened, the purpose of which was to gain support from the common people in the war against the pope.