Among the leading features of Greek life, especially those belonging to its religious customs and observances none are more characteristic, and none possess a more attractive interest for the modern reader and student than the peculiar festivals which it was their practice to hold. The four great national festivals or games were: The Olympic, held every four years, in honor of Zeus, on the banks of the Alpheus, in Elis; the Pythian, celebrated once in four years, in honor of Apollo, at Delphi; the Isthmian, held every two years, at the isthmian sanctuary in the Isthmus of Corinth, in honor of Poseidon (Neptune); and the Nemean, celebrated at Nemea, in the second and fourth years of each Olympiad, in honor of the Nemean Juno. With regard to the influence of these games or festivals upon the political and social life of Greece, much has been written by historians and special students of the Grecian states. While the celebrations do not appear to have accomplished much for the political union of Greece, they are to be credited with marked beneficial effects in the promotion of a pan-Hellenic spirit which, if it failed to produce such a union of the Greek race, nevertheless quickened and strengthened the common feeling of family relationship. Thus a sense of their identical origin and racial traits was kept alive, and the tendencies of Greek development and culture preserved their essential character and distinction. By means of these periodical gatherings, representing all parts of the Greek world, not only was friendly competition in every field of talent and performance secured, but even trade and commerce found through them new channels of activity. So in various ways the national games proved a source of fresh energy and broader enterprise among the various branches of the Grecian people. The particular character and significance of the Pythian games at Delphi, and their relation to the other national festivals, form an interesting subject for study in connection with the general history of Greece.