On 25 March 1821 (all the dates are given according to the Julian calendar), a few days after the outbreak of the Greek War of Independence in March 1821, the rebels of the southern Peloponnese, led by the Maniots, assembled at Kalamata and founded the Greek rebels' first organ of government, the Messenian Senate. As the uprising spread through Greece, the Messenian Senate's leader, Petrobey Mavromichalis, invited representatives from the rest of the Peloponnese in an assembly held at the Kaltetza Monastery. There, on 26 May the "Senate of the entire People of the Peloponnese provinces", commonly known, from the legend on its seal, as the "Peloponnesian Senate" and as the "Senate of Kaltetza" (Γερουσία των Καλτετζών), was founded, with Bishop Theodoritos of Vresthena as president and as secretary. Sotirios Charalambis, Athanasios Kanakaris, Anagnostis Deligiannis, Theocharis Rentis and Nikolaos Poniropoulos were members. Unlike the modern concept of a "senate" as the upper body of parliament, the Peloponnesian Senate was both a legislative and executive organ. The Senate's constitutional charter was created on 15 December 1821.