The periodical celebration of the three other national festivals was not dated—except in legend—before the early years of the sixth century B. C., though local festivals must have existed also on these sites long before.[89] The old music festival at Delphi, which finally was held every eight years,[90] was changed in 586 B. C., in consequence of the Sacred War,[91] into a Panhellenic festival celebrated thereafter every four years (_pentaëteris_). It was under the presidency of the Amphiktyonic League, which introduced athletic and equestrian events copied from those at Olympia[92] and replaced the older money prizes with the simple bay wreath. About the same time the Nemean and Isthmian games were instituted. The local games at Nemea, said to have been founded by Adrastos in honor of a child, were reorganized some time before 573 B. C., the first Nemead.[93] Thereafter they were celebrated every two years, in the second and fourth of the corresponding Olympiads.[94] They were administered in honor of Zeus by the small town of Kleonai under Argive influence. The games were transferred to Argos some time between 460 B. C. and the close of the third century B. C. Centuries later, Hadrian revived the prestige of the games at Argos. The games held on the Isthmus also originated as an old local festival, which was revived in 586 or 582 B. C. We are not sure whether they were refounded in Poseidon’s honor by Periandros or after the death of Psammetichos in commemoration of the ending of the tyranny at Corinth. The geographical location of Corinth, the meeting-place of East and West, involved it in many wars, and therefore the Isthmian games never attained the prestige of the other national festivals; they were held every two years in the spring of the second and fourth years of the corresponding Olympiads and were administered by Corinth.[95]