The new home was called Italia, after a branch of the original population which disappeared at an early date, and this name was gradually extended over the whole peninsula clear to the Alps. The land offered a boundless field for Hellenic activity, and the realisation of that fact found expression in the name Greater Hellas, which arose in the colonial territory across the Ionian Sea in about the sixth century, in contrast to the crowded condition of the too thickly populated mother-land. This may have been hyperbole, but it was in a sense justified by the brilliant development of the Achæan settlements. The coasts of the gulf of Tarentum became covered with a circle of flourishing cities. In the north at the mouth of the Bradanus was Metapontum, which bore on its armour the speaking device of an ear of corn; then came Siris in the fruitful plain at the mouth of the river of the same name, which, to the poet Archilochus appeared an ideal place for a colony; further south where Crathis empties into the sea, was Sybaris, whose wealth and luxury soon became proverbial. In close rivalry with Sybaris stood Croton, situated near the promontory of Lacinium, on the top of which the new settlers founded the temple of Hera, the queen of heaven, which became the chief sanctuary for the Greeks of Italy. One column of the building is still standing, a signal for ships, and can be seen from afar over the blue waters of the Ionian Sea. Finally, far to the south at Cape Stilo was Caulonia, the last of the Achæan settlements.
The Achæans soon penetrated also into the interior and through the narrow peninsula to the shores of the Tyrrhenian Sea. Sybaris founded here the colonies of Scidrus and Laos, and, further north, on the lower Silarus, Posidonia [afterwards Pæstum], whose temple to-day arises in solemn majesty from out its desolate surroundings, the most beautiful monument of Grecian architecture which has been preserved on the western side of the Ionian Sea. Pyxus [afterwards Buxentum], between Posidonia and Laos, is probably a colony from Siris, which was directly opposite it on the Ionian Sea, and was later closely associated with it. Croton founded Pandosia in the upper valley of the Crathis, and Terina and Scylletium (Scylacium) on the isthmus of Catanzaro where the Ionian and Tyrrhenian seas approach to within a few miles of each other. The Achæans now controlled the whole region from the Bradanus and Silarus southward to the gulf of Terina and the gulf of Scylletium, an area of fifteen thousand square kilometres.
The Achæans were soon followed by the Locrians, who lived opposite them on the gulf of Corinth. They founded a new Locri, south of the Achæan settlements not far from the Zephyrian promontory. This city also soon became rich and powerful, so that its territory was extended to the west coast of the peninsula, where it established the colonies Hipponium and Medma.
In the meantime the inhabitants of eastern Greece had begun to direct their gaze to the newly discovered lands in the west—first of all the Chalcidians, the bravest men in Hellas, as they are called in an old proverb. Since the coast of the gulf of Tarentum was already occupied, they sailed further, to Sicily the land famed in fable as the home of the Cyclops and Læstrygones. These were no longer to be found there, but instead a people of Italic race, the Siceli, or the Sicani, as they were called in the western part of the island, a brave and warlike people, but with no national unity so that they were unable successfully to oppose the invaders. Here, at the foot of the lofty snow pyramid of Ætna, the Chalcidians founded Naxos, their first settlement and the first Hellenic town on Sicilian soil. In gratitude to the god, Apollo Archegetes, who had brought them over the sea in safety, the settlers erected an altar. Later on, when Sicily had become an Hellenic land, all those who were setting sail to attend the festivals in the mother-land used to sacrifice at this place.