Pnyx III: The Pnyx was rebuilt and expanded in the 3rd quarter 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.