http://agathe.gr/democracy/sokrates.html
Sokrates The philosopher Sokrates was one of many Athenians critical of the people and their control over affairs of state. His probing public debates with fellow citizens led to his trial for impiety ... The preliminary indictment leading to Sokrates' trial took place in the Royal Stoa and he was tried before a jury of 501 Athenians, in one of the lawcourts of the city, not as yet excavated. ... This set of thirteen, found in the annex to the state prison, may have been used to hold the hemlock that was measured out in the exact dose necessary to cause death.