In December 1821 the First National Assembly opened its proceedings at Piada (ancient Epidauros). Representatives from the most rebellious regions attended the assembly. The majority of the representatives were local notables and clergymen from the Morea, Rumeli and the islands. These were the pre-revolutionary social elites to which the Phanariotes and scholars, who had reached the rebellious districts in the first months of the Revolution, were added. Conversely, Dimitrios Ypsilantis and the most prominent chieftains from Rumeli and the Peloponnese were absent. The most significant act of the assembly was the Provisional Constitution of Epidauros, that is to say the first constitution of the rebellious Greeks, in which the Declaration of Independence was included. The Provisional Constitution, a work of the Italian V. Gallina, included the liberal and democratic principles of the French revolutionary constitutions (1793 and 1795), as well as those of the constitution of the United States of America (1787). As far as the formation of two organs of the administration was concerned, a multi-central model was adopted with the composition of two annual bodies (deliberative and executive), whose duties were unclearly defined.

The official acknowledgement of the three regional organizations in the Peloponnese, west and east-central Greece increased the confusion among the administration, the split of the political field and finally the weakness of the central control of the rebellious regions which composed the territory of the future Greek state. The fact that no reference whatsoever was made to the Philiki Etaireia in the First National Assembly is noteworthy. The organization which had prepared the Greek Revolution had been definitively pushed out of the limelight. Two years after the declaration of the Revolution in the Peloponnese, specifically in March 1823, the proceedings of the Second National Assembly opened at Astros, Kynouria. In the time that elapsed between the First and Second National Assembly, the successful military operations kept pace with the worsening of the political controversies. The abolition of the regional local-administrative organizations gave power to the organs of the central administration and placed them in the middle of political contests. In the framework of political factions the attendants of the National Assembly issued a restricted revision of the constitution, which confirmed the basic principles of the Provisional Constitution of Epidauros.