 Complete the following phrase:  During the flourishing period of Greek history, it was regarded as the chief city of the eastern Locrians, for the distinction between the Opuntii and Epicnemidii is not made either by Herodotus, Thucydides, or Polybius. Even Strabo, from whom the distinction is chiefly derived, in one place describes Opus as the capital of the Epicnemidii; and the same is confirmed by Pliny and Stephanus of Byzantium. The Opuntii joined Leonidas with all their forces at the Battle of Thermopylae, and sent seven ships to the Greek fleet at 