Latium furnished the finest timber for ship-building, far surpassing the famed growths of Lower Italy; and the very docks constantly maintained in Rome are enough to show that the Romans never abandoned the idea of possessing a fleet of their own.

During the perilous crises, however, which the expulsion of the kings, the internal disturbances in the Romano-Latin confederacy, and the unhappy wars with the Etruscans and Celts brought upon Rome, the Romans could take but little interest in the state of matters in the Mediterranean; and, in consequence of the policy of Rome directing itself more and more decidedly to the subjugation of the Italian continent, the growth of its naval power was arrested.
There is hardly any mention of Latin vessels of war up to the end of the fourth century, except that the votive offering from the Veientine spoil was sent to Delphi in a Roman vessel (360).

The Antiates indeed continued to prosecute their commerce with armed vessels and thus, as occasion offered, to practise the trade of piracy also, and the "Tyrrhene corsair" Postumius, whom Timoleon captured about 415, may certainly have been an Antiate; but the Antiates were scarcely to be reckoned among the naval powers of that period, and, had they been so, the fact must from the attitude of Antium towards Rome have been anything but an advantage to the latter.

The extent to which the Roman naval power had declined about the year 400 is shown by the plundering of the Latin coasts by a Greek, presumably a Sicilian, war fleet in 405, while at the same time Celtic hordes were traversing and devastating the Latin land.( 7) In the following year (406), and beyond doubt under the immediate impression produced by these serious events, the Roman community and the Phoenicians of Carthage, acting respectively for themselves and for their dependent allies, concluded a treaty of commerce and navigation-- the oldest Roman document of which the text has reached us, although only in a Greek translation.( 8) In that treaty the Romans had to come under obligation not to navigate the Libyan coast to the west of the Fair Promontory (Cape Bon) excepting in cases of necessity.

On the other hand they obtained the privilege of freely trading, like the natives, in Sicily, so far as it was Carthaginian; and in Africa and Sardinia they obtained at least the right to dispose of their merchandise at a price fixed with the concurrence of the Carthaginian officials and guaranteed by the Carthaginian community.