From Naxos the Chalcidians soon took possession of the surrounding region. In the south they founded Catane, Leontini, Callipolis, Eubœa; in the north, on the strait which separates Sicily from Italy, they built Zancle, the later Messana, or Messina, and opposite this on the mainland Rhegium was established. Here the wide Tyrrhenian Sea was open to the Hellenes. The precipitous western coast of the Calabria of to-day and the waterless Liparæan Islands were not indeed attractive to settlers, but on the small island Pithecusa (Ischia), off the coast of the Osci, was the most favourable spot a colonist could wish—the soil being luxuriantly fertile and at the same time secure from hostile attacks. Thus the Calcidians established themselves here at an early date, perhaps in the eighth century. Soon they ventured over to the near-lying continent, and on the steep trachyte cliff, upon the flat, wave-beaten shore of the gulf of Gæta, they founded Cumæ, so called from a place [Cyme] in the old Eubœan home-land.
Neapolis, the “new city” was colonised from here in about the year 600, while Samian fugitives settled at Dicæarchia [afterwards Puteoli], in close proximity to Cumæ (in 527). The second large island of the Neapolitan Bay, Capreæ must also have been settled by Chalcidians, since we find a Hellenic population there even in the period of the empire.
Cumæ is the most extreme westerly point of Italy which the Chalcidians, and indeed the Hellenes as a whole, ever possessed. It has always remained, as it was first established, the most advanced frontier post, and the continuous territory of Grecian colonisation in Italy ends at the Silarus. A similar position was occupied on the southern shore of the Tyrrhenian Sea by Himera, which was colonised from Messana in about the year 650, and was the only Grecian city on the northern coast of Sicily. Chalcidian colonisation in the west came to an end with this settlement.
The example given by Chalcis was soon imitated. The Corinthians in the eighth century still occupied the rich island of Corcyra and likewise turned their steps to Sicily. Since the region around Ætna and the strait was already occupied by Chalcidians, they went further south and established the colony of Syracuse upon the small island of Ortygia, in the most beautiful harbour on the eastern coast of Sicily. This colony was destined to become the metropolis of the Grecian west. The real colonising activity of Corinth, however, was directed chiefly towards the northwestern part of the Grecian peninsula. In the course of the eighth century a dense circle of Corinthian and Corintho-Corcyræan settlements grew up here: among them Chalcis and Molycrium in Ætolia at the entrance to the bay of Corinth.
Like Corinth, its neighbour city Megara began at an early date to take part in the colonisation of Sicily. A new Megara arose here, between Syracuse and the Chalcidian Leontini, professedly in the eighth century, at any rate before Syracuse had acquired much importance and had begun to found colonies of its own. Its powerful neighbours made it impossible for the city to expand towards the interior and thus the Megarians were obliged to go further west, when their territory became too cramped for them at home. They founded Selinus, not far from the most western point of the island on the coast of the Libyan Sea, at about the same time that the Chalcidians laid out Himera on the opposite coast (about 650). On account of the fertility of the district the new colony soon reached a high grade of prosperity and established on its own account a number of settlements, such as Minoa, near the mouth of the Halycus (Platani) so called from the little island of like name in the old Grecian home.
Of the other states of the Grecian mother-land only Sparta took part in the settlement of the west. Inner disturbances which broke out after the conquest of Messenia are said to have caused a portion of the conquered party to leave their home. The emigrants set sail for Iapygia and established there, upon the only good harbour on the southeast coast of Italy, the colony of Tarentum (700 B.C.). Two centuries later, shortly before the Persian wars, the Spartans made an attempt to establish themselves in the west.