At the start, between 1814 and 1816, there were roughly twenty members. During 1817, the society initiated members from the diaspora Greeks of Russia and the Danubian Principalities of Moldavia and Wallachia. The Prince of Moldavia Michael Soutzos himself, became a member. Massive initiations began only in 1818 and by early 1821, when the Society had expanded to almost all regions of Greece and throughout Greek communities abroad, the membership numbered in thousands. Among its members were tradesmen, clergy, Russian consuls, Ottoman officials from Phanar and revolutionary Serbs, most notably, the leader of the Serbian Revolution, father of the modern Serbia and founder of the Karadjordjevic dynasty Karageorge Petrovic. Members included primary instigators of the Greek revolution, notably Theodoros Kolokotronis, Odysseas Androutsos, Dimitris Plapoutas, Papaflessas and the metropolitan bishop Germanos of Patras.