The Achaean league, the prosperity of which was arrested by the narrow-minded coterie- policy of Aratus, the Aetolian republic of military adventurers, and the decayed Macedonian empire kept each other in check; and the Romans of that time avoided rather than sought transmarine acquisitions.
When the Acarnanians, appealing to the ground that they alone of all the Greeks had taken no part in the destruction of Ilion, besought the descendants of Aeneas to help them against the Aetolians, the senate did indeed attempt a diplomatic mediation; but when the Aetolians returned an answer drawn up in their own saucy fashion, the antiquarian interest of the Roman senators by no means provoked them into undertaking a war by which they would have freed the Macedonians from their hereditary foe (about 515).
Illyrian Piracy Expedition against Scodra Even the evil of piracy, which was naturally in such a state of matters the only trade that flourished on the Adriatic coast, and from which the commerce of Italy suffered greatly, was submitted to by the Romans with an undue measure of patience, -- a patience intimately connected with their radical aversion to maritime war and their wretched marine.

But at length it became too flagrant.

Favoured by Macedonia, which no longer found occasion to continue its old function of protecting Hellenic commerce from the corsairs of the Adriatic for the benefit of its foes, the rulers of Scodra had induced the Illyrian tribes--nearly corresponding to the Dalmatians, Montenegrins, and northern Albanians of the present day--to unite for joint piratical expeditions on a great scale.
With whole squadrons of their swift-sailing biremes, the veil-known "Liburnian" cutters, the Illyrians waged war by sea and along the coasts against all and sundry.

The Greek settlements in these regions, the island-towns of Issa (Lissa) and Pharos (Lesina), the important ports of Epidamnus (Durazzo) and Apollonia (to the north of Avlona on the Aous) of course suffered especially, and were repeatedly beleaguered by the barbarians.

Farther to the south, moreover, the corsairs established themselves in Phoenice, the most flourishing town of Epirus; partly voluntarily, partly by constraint, the Epirots and Acarnanians entered into an unnatural symmachy with the foreign freebooters; the coast was insecure even as far as Elis and Messene.
In vain the Aetolians and Achaeans collected what ships they had, with a view to check the evil: in a battle on the open sea they were beaten by the pirates and their Greek allies; the corsair fleet was able at length to take possession even of the rich and important island of Corcyra (Corfu).