(M343) After three generations, the Heraclidæ set out to regain their inheritance, assisted by the Dorians. They at length, after five expeditions, gained possession of the country, and divided it, among the various chieftains, who established their dominion in Argos, Mycenæ, and Sparta, which, at the time of the Trojan war, was ruled by Agamemnon and Menelaus, descendants of Pelops. In the next generation, Corinth was conquered by the Dorians, under an Heraclide prince. (M344) The Achæans, thus expelled by the Dorians from the south and east of the Peloponnesus, fell back upon the northwest coast, and drove away the Ionians, and formed a confederacy of twelve cities, which in later times became of considerable importance. The dispossessed Ionians joined their brethren of the same race in Attica, but the rugged peninsula was unequal to support the increased population, and a great migration took place to the Cyclades and the coasts of Lydia. The colonists there built twelve cities, about one hundred and forty years after the Trojan war. Another body of Achæans, driven out of the Peloponnesus by the Dorians, first settled in Bœotia, and afterward, with Æolians, sailed to the isle of Lesbos, where they founded six cities, and then to the opposite mainland. At the foot of Mount Ida they founded the twelve Æolian cities, of which Smyrna was the principal. (M345) Crete was founded by a body of Dorians and conquered Achæans. Rhodes received a similar colony. So did the island of Cos. The cities of Lindus, Ialysus, Camirus, Cos, with Cnidus and Halicarnassus, on the mainland, formed the Dorian Hexapolis of Caria, inferior, however, to the Ionian and Æolian colonies. (M346) At the beginning of the mythical age the dominant Hellenic races were the Achæans and Æolians; at the close, the Ionians and Dorians were predominant. The Ionians extended their maritime possessions from Attica to the Asiatic colonies across the Ægean, and gradually took the lead of the Asiatic Æolians, and formed a great maritime empire under the supremacy of Athens. The Hellenic world ultimately was divided and convulsed by the great contest for supremacy between the Dorians and Ionians, until the common danger from the Persian invasion united them together for a time. (M347) Thus far we have only legend to guide us in the early history of Greece. The historical period begins with the First Olympiad, B.C. 776. Before this all is uncertain, yet as probable as the events of English history in the mythical period between the departure of the Romans and the establishment of the Anglo-Saxon kingdom. The history is not all myth; neither is it clearly authenticated.