=34.= B. C. 1104. Twenty year’s later, a still more important movement took place. The Dorians, cramped by the narrow mountain limits of their abode, united with their western neighbors, the Ætolians, to invade the Peloponnesus. It is said that they were conducted by Tem´enus, Cresphontes, and Ar´istode´mus, in pursuance of the claims of their great ancestor, Hercules, who had been expelled from the southern peninsula a hundred years before. The Dorian migration is therefore often called the Return of the Heraclidæ. Aristodemus was killed by lightning when about to cross the Corinthian Gulf. His brothers were completely victorious over the king of the Achæans, then the most powerful monarch in the Peloponnesus, and proceeded to divide the peninsula between themselves and their allies. The Ætolians received Elis, on the western coast; the rest of the peninsula, except its northern border on the Corinthian Gulf, remained to the Dorians, who continued for five centuries to be the dominant race in Greece. The Heraclid princes then divided the various crowns by lot. That of Argos fell to Temenus; that of Messenia, to Cresphontes; and that of Sparta, to Eurysthenes and Procles, the twin sons of Aristodemus. =35.= The conquered Achæans were forced either to emigrate to Asia and Italy, or to content themselves with the northern coast of their peninsula, from which they expelled its Ionian inhabitants, and gave it their own name, Achaia. The Ionians, after resting a few years in Attica, whose people were their kinsmen, sought more space in the Cyclades, in Chios and Samos, or on the neighboring coasts of Asia Minor. In the fertile region between the Hermus and Mæander, and on the islands, twelve Ionian cities[38] sprang up, and became rich and flourishing states. Though independent of each other in government, they were united in the worship of Posidon at one common temple, the Panio´nium, which crowned the headland of Mycale. =36.= The Æolians had already been driven from their ancient home in central Greece, and had found refuge in Lesbos and the north-western coast of Asia Minor, between the Hermus and the Hellespont. They, also, formed twelve independent cities, but Mytile´ne, on the isle of Lesbos, was considered the metropolis. =37.= The Dorians, extending their migrations beyond the conquered peninsula, took possession of the south-western coast of Asia Minor, with the islands of Cos and Rhodes. Their six cities—sometimes called the Doric Hexapolis—were Cni´dus and Halicarnassus, on the mainland; Ial´yssus, Cami´rus, and Lindus, on the isle of Rhodes; and Cos, on the island of its own name. Like the Ionians, they worshiped at a common sanctuary, the temple of the Triopian Apollo. RECAPITULATION.