The purpose of this article is to examine concretely the transition from the feudal society to the political society around the defeat of the Battle of Crecy in 1346 and the assembly of the states in 1347. At the beginning of the 14th century, the state system operating around the war and the tax is considered limited to exceptional and necessary cases. So, the unity and the perpetuity presupposed by the state system could not get no stable legitimacy of members of the political society. In this context, with the beginning of the Hundred Years War, calling for the preparation of long-term, the government of Philip VI faced the severe challenge of assembly of the states. As taxation was justified only by the outbreak of war, the preparation before the outbreak of war was seen as unjust policy. Yet the successive defeats of France, especially the inability of the king and nobles revealed in the defeat of the Battle of Crécy provides members of political society a good reason for their new political movement. From the assembly of the states in 1347, they began to try to actively intervene in state government beyond the royal initiative. Specifically, this assembly shows great historical significance: in relation to taxation, it no longer insisted the refusal but the control. This phenomenon means that the feudal society turns into political society for good in France and that the interests of political society were concentrated the central scene around the capital Paris, disengaging the regionalist character. In the situation of a series of economic disasters and social crises, the Black Death, chronic war and the failure of life of people, the deprived of political right began demanding the right to Policy based on a political affect for a respublica in common.