The long list of Spartan successes begins in Ol. 15 (720 B.C.), and continues till Ol. 50 (576 B.C.), from which date they cease almost entirely. During most of this period the superiority of Sparta is undisputed. This superiority may be partially explained by the careful records of athletic victories kept in that most methodical of states, whereas the records of other states were less careful and less accessible to the historian. Yet making full allowance for our imperfect knowledge of other states, the Spartan successes are sufficiently remarkable, and their sudden cessation hardly less so. Aristotle has given us the explanation of these facts.[67] Sparta was the first Greek state to introduce a systematic physical and military training, which for a time made her unrivalled in sport and war; when other states followed her example, her superiority disappeared. Moreover, in the seventh century Sparta was still a progressive, enlightened state, fond of poetry and music, taking an energetic part in all the manifold activities of Greek life; only the good effects of her system were yet apparent; its iron rule had not yet produced that narrow spirit of exclusiveness which was fatal to progress.[68] Hence Spartan participation in the Olympic festival not only raised the prestige of the festival, but gave a new importance and seriousness to athletics. Hitherto they had been a diversion of the nobles; henceforth they were to be part of the education of the people. The physical education of Greece was largely due to Spartan example. At the beginning of the sixth century we find Solon making laws for the palaestrae and gymnasia, and we may suspect that most important cities possessed these institutions.