Council of Five Hundred, boule or deliberative council in ancient Athens that comprised representatives chosen by lot (sortition) to represent citizens of the city-state. It was one component of the Athenian system of government after the reforms of Cleisthenes, which are regarded as the foundation of Athenian democracy.
The heart and centre of the Cleisthenic system in Athens was the Assembly (Ecclesia) of citizens, which met 40 times per year on the Pnyx, a hill west of the Acropolis. Decisions were taken by vote, in which the votes of a majority of those present and voting prevailed. The agenda of the Assembly was set by the Council of Five Hundred, which, unlike the Assembly, was composed of representatives chosen proportionally from each of the territorial entities, known as demes, created by Cleisthenes in 508/507 bce. The Council’s use of representatives (though chosen by lot rather than by vote) foreshadowed the election of representatives in later democratic systems.
Cleisthenes’ reforms did not altogether originate the Council but built it within a preexisting institution: the Athenian Boule that was created by Solon in 594 bce. Although Solon’s council limited the power of the eupatrids (nobles by birth) and offered voice to the lower classes, it functioned alongside the guardianship of the Areopagus, a council of elders, and it did not eliminate the contentions of the old aristocracy for control over public policy. Thus, after the tyranny of the Peisistratids was ended, Cleisthenes reorganized the entire citizen body into 10 new tribes, each of which was to contain elements drawn from the whole of Attica. These tribes, organized initially on nothing more than residence and no longer based purely on descent from the four Ionian tribes, would from then on determine whether a man was Athenian and so fix his eligibility for military service.
After the reforms of Cleisthenes, the Council was elected by lot every year, except during the brief periods of oligarchic reaction in 411 and 404 bce. Each of Cleisthenes’ 10 tribes was provided 50 councillors who were at least 30 years old; a certain number of councillors was allotted to each deme (rural district or village) of the tribe in rough proportion to its size. The functions of the Council were defined by the oath for the members, introduced in 501 bce. A man chosen by lot was not obliged to serve. Since poorer citizens might have been unwilling to serve, the Council was dominated by men of property. Property qualifications did not operate in the Boule, however, before 322 bce.
The most important task of the Council was to draft the deliberations (probouleumata) for discussion and approval in the Ecclesia. The Council also directed finances, controlled the maintenance of the fleet and of the cavalry, judged the fitness of the magistrates-elect, received foreign ambassadors, advised the stratēgoi (see strategus) in military matters, and could be given special powers by the Ecclesia in an emergency. The Council never totally replaced the Areopagus in political importance, however, even after the reforms of Ephialtes (462/461) that took aim at the latter institution.