 This treaty is placed about the 50th Olympiad, or 580 BCE, since it belongs to a time when the Eleians exercised an undisputed supremacy over the dependent districts of Pisatis and Triphylia; and the Heraeans consequently were anxious to avail themselves of their support.Heraea was, at that time, the chief village among eight others which lay scattered upon the banks of the Alpheius and its tributaries the Ladon and Erymanthus; but the inhabitants of these separate villages were transferred to Heraea, and a city there was founded by the Spartan king Cleombrotus I or Cleonymus.In consequence of their close connection with Sparta, the Heraeans incurred the hostility of the other Arcadians, who laid waste their territory in 370 BCE.