At this epoch, when Tarentum was still contending with Sybaris for the first place among the Greek cities of Lower Italy, its extensive commercial connections must have been already forming; but the Tarentines seem never to have steadily and successfully directed their efforts to a substantial extension of their territory after the manner of the Achaean cities.
Greek Cities Near Vesuvius While the most easterly of the Greek settlements in Italy thus rapidly rose into splendour, those which lay furthest to the north, in the neighbourhood of Vesuvius, attained a more moderate prosperity.
There the Cumaeans had crossed from the fertile island of Aenaria (Ischia) to the mainland, and had built a second home on a hill close by the sea, from whence they founded the seaport of Dicaearchia (afterwards Puteoli) and, moreover, the "new city" Neapolis.

They lived, like the Chalcidian cities generally in Italy and Sicily, in conformity with the laws which Charondas of Catana (about 100) had established, under a constitution democratic but modified by a high census, which placed the power in the hands of a council of members selected from the wealthiest men--a constitution which proved lasting and kept these cities free, upon the whole, from the tyranny alike of usurpers and of the mob.

We know little as to the external relations of these Campanian Greeks.

They remained, whether from necessity or from choice, confined to a district of even narrower limits than the Tarentines; and issuing from it not for purposes of conquest and oppression, but for the holding of peaceful commercial intercourse with the natives, they created the means of a prosperous existence for themselves, and at the same time took the foremost place among the missionaries of Greek civilization in Italy.
Relations of the Adriatic Regions to the Greeks While on the one side of the straits of Rhegium the whole southern coast of the mainland and its western coast as far as Vesuvius, and on the other the larger eastern half of the island of Sicily, were Greek territory, the west coast of Italy northward of Vesuvius and the whole of the east coast were in a position essentially different.

No Greek settlements arose on the Italian seaboard of the Adriatic; and with this we may evidently connect the comparatively small number and subordinate importance of the Greek colonies planted on the opposite Illyrian shore and on the numerous adjacent islands.