The island of Corcyra had been occupied, in an early age, by a colony from Corinth. The political connection of colonies with the mother-country will always depend upon their respective strength; and the Grecian colonies, all having been the offspring of very small states, in many instances acquired more than the parent’s force. Corcyra, already populous, had not yet entirely broken its connection with Corinth, when the resolution was taken by its government to settle a colony on the Illyrian coast. An embassy was therefore sent, in due form, to desire a Corinthian for the leader. Phaleus, of a family boasting its descent from Hercules, was accordingly appointed to that honour: some Corinthians and others of Dorian race accompanied him; and Phaleus thus became the nominal founder of Epidamnus, which was however considered as a Corcyræan, not a Corinthian colony.
But in process of time Epidamnus, growing populous and wealthy, followed the example of its mother-country, asserted independency, and maintained the claim. Like most other Grecian cities, it was then, during many years, torn by sedition; and a war supervening with the neighbouring barbarians, it fell much from its former flourishing state. But the spirit of faction remaining in spite of misfortune untamed, the commonalty at length expelled all the higher citizens. These, finding refuge among the Illyrians, engaged with them in a predatory war, which was unremittingly carried on against the city by land and sea. Unable thus to rest, and almost to subsist, the Epidamnians in possession requested assistance from Corcyra. This humble supplication however being rejected, they hastened a deputation to Corinth.
Fortunately for their object, though peace had not yet been broken, yet animosity between Corinth and Corcyra had so risen that the Corcyræans, who had long refused political dependency, now denied to the Corinthians all those honours and compliments usually paid by Grecian colonies to their parent states. Under stimulation thus from affront, and with encouragement from the oracle, the prospect of an acquisition of dominion was too tempting, and the proposal of the Epidamnians was accepted. But Corinth had at this time only thirty ships of war, whereas Corcyra was able to put to sea near four times the number; being, next to Athens, the most powerful maritime state of Greece. Application for naval assistance was therefore made to the republics with which Corinth was most bound in friendship, and thus more than forty vessels were obtained. It had been the settled policy of the Corcyræans, islanders and strong at sea, to engage in no alliances. They had avoided both the Peloponnesian and the Athenian confederacy; and hitherto with this policy they had prospered. But, alarmed now at the combination formed against them, and fearing it might still be extended, they sent ambassadors to Lacedæmon and Sicyon; who prevailed so far that ministers from those two states accompanied them to Corinth, as mediators in the existing differences. In presence of these the Corcyræan ambassadors proposed to submit the matters in dispute to the arbitration of any Peloponnesian states, or to the Delphian oracle, which the Corinthians had supposed already favourable to them. The Corinthians however, now prepared for war, and apparently persuaded that neither Lacedæmon nor Sicyon would take any active part against them, refused to treat upon any equal terms, and the Corcyræan ambassadors departed (435 B.C.).
[435-433 B.C.]
The Corinthians then hastened to use the force they had collected. The Corcyræans had manned those of their ships which were already equipped, and hastily prepared some of those less in readiness, when their herald returned, bearing no friendly answer. With eighty galleys then they quitted their port, met the enemy off Actium, and gained a complete victory, destroying fifteen ships. Returning to Corcyra, they erected their trophy on the headland of Leucimme, and they immediately put to death all their prisoners, except the Corinthians, whom, as pledges, they kept in bonds. Epidamnus surrendered to their forces on the same day.
The opportunities now open, for both revenge and profit, were not neglected by the Corcyræans. During that year, unopposed on the sea, there was scarcely an intermission of their smaller enterprises; by some of which they gained booty, by others only gave alarm, but by all together greatly distressed the Corinthians and their allies (434 B.C.).