Corruption naturally throve under such conditions.[216] Only Olympia, thanks to its ancient prestige and sanctity, maintained the purity of sport, and though even there all sport was professional, cases of corruption were rare. The decay of athletics was accompanied by an increased activity in the construction and improvement of gymnasia and stadia, which continued all through Hellenistic and Roman times. The stadia at Olympia and Delphi were reconstructed during the fourth century; the Panathenaic stadium at Athens was the work of the Athenian administrator Lycurgus, who also rebuilt the Lyceum Gymnasium, planted it with trees, and built a new palaestra or wrestling-school in it. But this building activity did not denote any improvement of the national athletics. The people took little interest in the games, save as a spectacle, and the improvements made in the stadia were connected solely with the accommodation and comfort of spectators. Some of these buildings were the work of a sort of athletic revival, a temporary demand for physical and military training. Such a movement occurred at Athens in the time of Alexander, under the wise leadership of Lycurgus, who, among the numerous services which he rendered to Athens, reorganized the Athenian epheboi. More often these buildings were the monuments of the generosity or vanity of wealthy princes or ambitious citizens. But the palaestra and gymnasium, even in the fourth century were no longer devoted principally to gymnastics. The colonnades of the palaestra, the shady walks of the gymnasium were popular resorts and lounging-places. There the Athenian gentleman would betake himself in the afternoon to get an appetite for his evening meal; and a whole series of rooms was provided for his accommodation—dressing-rooms, oiling-rooms, dusting-rooms, bath-rooms, cloisters where he could take his exercise in wet weather, rooms for ball-play, and, for the more active, wrestling-rings and running tracks. Many of the rooms and the walks were provided with benches and seats for the convenience of visitors and spectators. Sophists especially resorted there in the hope of attracting pupils; some of them attached themselves to particular gymnasia. Plato delivered his discourses in the Academy; Aristotle took his morning and evening walks in the Lyceum. Gradually the social and educational side of the gymnasium became more important than the athletic. The gymnasium of Cynosarges in the fourth century was the meeting-place of a celebrated club known as the Sixty Wits. The earlier gymnasia of Athens had been outside the walls. The first gymnasium inside the walls was the gift of the versatile Ptolemaeus Philadelphia (285-247 B.C.), the founder of the museum and library of Alexandria. The gymnasium at Athens bore witness to the culture of its founder: it contained a library formed and increased by contributions from the students who attended it. Lectures continued to be given in it by