http://agathe.gr/democracy/the_ekklesia.html
The Ekklesia (Citizens' Assembly) All Athenian citizens had the right to attend and vote in the Ekklesia, a full popular assembly which met about every 10 days. All decrees (psephismata) were ratified ... The Pnyx, about SOO B.C. ... Three phases of the Pnyx. Drawing by John Travlos. ... Throughout its long history the Pnyx had three major building phases.