second must have been added when Elis secured a share in the government. Moreover, the selection of the two officials by lot, a thoroughly democratic institution, is unthinkable in Elis, at that time an oligarchy of oligarchies, though it may well have been introduced when the democrats of Elis obtained the mastery. Lastly, the date of the final destruction of Pisa, about which Pausanias is obviously confused, is contradicted by the direct statement of Herodotus, who speaks of the war in which it took place as “in my days” (ἐπ’ ἐμέο).[53] The earlier date has been supported by reference to a sixth-century inscription at Olympia recording a treaty for mutual defence between Elis and Heraea, by the terms of which either party failing to help the other is liable in case of need to a fine of a talent of silver to Olympian Zeus.[54] Too much, perhaps, has been made of this inscription, which is probably one of many such local treaties, the record of which has perished. Moreover, it seems highly probable that Heraea, so far from being opposed to Pisa, was a member of the early Pisatan league. The original claims of Pisa are admitted by all modern historians; all further difficulties vanish on the supposition of a subsequent dual control, in which Elis gradually became the predominant partner until, in the fifth century, she ousted Pisa completely. The regulations for competitors may be traced back to the earliest times. No one in later days was allowed to compete who was not of pure Greek parentage on both sides, or who had neglected to pay any penalty incurred to Olympian Zeus, or who had incurred ceremonial pollution by manslaughter, committed, we may suppose, in the sacred territory. These restrictions had their origin in a religious festival that formed a bond of union between neighbouring communities, which was gradually extended through the sacred truce-bearers till it embraced the whole Greek race. That this local or tribal exclusiveness grew into a Panhellenic exclusiveness, was due partly to the influence of the Dorians, partly to the close connexion of the colonies with Olympia. In the fifth century Alexander, the son of Amyntas, was not allowed to compete at Olympia until he had first satisfied the Hellanodicae that he was of Greek descent.