ἀγορεύειν βούλεται;", "Who wishes to speak to the Popular Assembly?"). The Pnyx was protected by a defense wall built in the fourth century BC and reconstructed a century later. The new walls, made of almost solid masonry and ashlar blocks, were two-meter thick. The stretch began on a northern end with a tower that stood south of the Melitides Gate of the Themistoclean Wall and ended at the western end of the summit where it joined the Diateichisma. The wall featured seven towers set with 40-meter interval while the connecting walls were strengthened by buttresses. Early history and phases The Pnyx was the official meeting place of the Athenian democratic assembly (). In the earliest days of Athenian democracy (after the reforms of Kleisthenes in 508 B.C.), the ekklesia met in the Agora. Sometime in the early 5th century, the meeting place was moved to a hill south and west of the Acropolis. This new meeting place came to be called "Pnyx" (from the Greek word meaning "tightly packed together". In the early history of the Pnyx, three phases can be distinguished: Pnyx I: Probably constructed in the early 5th century. The people apparently sat on the hillside facing a speaker's platform on the north. The seating capacity may have been anywhere from 6000 to 13,000 people. This phase is represented archaeologically only by a few cuttings in the bedrock and a boundary stone (not found in situ), so that it is impossible to determine the date and size with any precision. Pnyx II: Probably late 5th century B.C. In this phase the orientation of the auditorium was apparently reversed (a reconstruction that is based more upon ancient literary sources than from the actual archaeological record). A stepped terrace wall was created on the north to support an artificial terrace, and the people sat facing a speaker's platform on the south. Some sources stated that this retaining wall was constructed around 500 BC for the purpose of holding the soil that was brought in to form the level space for the bema. Part of the stepped terrace wall is preserved, as well as a staircase with rock-cut steps leading up to it from the direction of the Agora. The size of the auditorium (as it is restored by the excavators) is not that much larger than Pnyx I. Pnyx III: The Pnyx was rebuilt and expanded in the 3rd quarter