of the 4th century B.C., probably around 345-335 B.C. A massive, curved, retaining wall was built (or at least begun) on the north. The southern side of the auditorium and speaker's platform (bema) were quarried out of the natural bedrock. (Traces of the quarrying process can still be seen at the eastern side of the great rock-cut scarp). On a terrace above (south of) the speaker's platform, the foundations were begun for 2 long stoas (but these seem never to have been finished). It is unknown for how many years Pnyx III was used as the meeting place of the ekklesia, and certainly by the 1st century B.C. the assembly held their meetings in the Theater of Dionysos on the South Slope of the Acropolis. Finally, in the Roman period, part of the Pnyx was used as a sanctuary of Zeus Hypsistos. Evidence for the sanctuary consist of c. 50 niches for votive plaques cut into the bedrock scarp east of the speaker's platform. Many of the votive plaques are carved with representations of human body parts (eyes, breasts, etc.), suggesting that this Zeus Hypsistos was a healing divinity. Athenian democracy Scholars such as Mogens Herman Hansen suggest the Pnyx was able to hold about 6,000 citizens, though later expansions may have accommodated 8,000 or as many as 13,000. French classical scholar Robert Flacelière states that the Pnyx had enough standing room for as many as 20,000 citizens, though this is disputed. The grassy area in front of the bema was in ancient times an area of bare rock, on which about 6,000 men could stand. This can be taken as a reasonable estimate of the number of politically active citizens (citizens were free males born in the city, or perhaps 20% of the adult population). There were wooden seats for the members of the Council of 500, who were selected by lot for terms of a single year to run the city on a day-to-day basis, and prepare the agenda for the Assembly. In later times two stoae, or covered galleries, were built to protect the dignitaries against the rain and sun. In theory, all citizens were equal and all of the male citizens had the right to speak. In practice, relatively few citizens actually spoke or proposed actions. A citizen who made a proposal might be subjected to a future prosecution (graphe paranomon) if the proposal was illegal