The Locrians are said to have arrived in southern Greece in the late 2nd millennium BC from their homeland on Pindus, when the Greek tribes moved southwards. In historical times, the Locrians were divided into two distinct tribes, differing from each other in customs, habits and civilization. Of these, the eastern Locrians, called the Opuntian and Epicnemedian, dwelt on the eastern coast of Greece, opposite the island of Euboea, while the western Locrians, called Ozolian or Esperian, dwelt on the Corinthian gulf and were separated from the former by Mount Parnassus and the whole of Doris and Phocis.