An alliance with the Megarians, who were being hard pressed by their neighbours of Corinth, led to enmity with this latter power, and before long Epidaurus and Aegina were drawn into the struggle.
He traces back the hostility of the two states to a dispute about the images of the goddesses Damia and Auxesia, which the Aeginetans had carried off from Epidaurus, their parent state.
The Tholos at Epidaurus, built by Polycleitus (c. 400 B.C.), and the Tholos at Olympia, known as the Philippeion, are the most remarkable examples, and in both cases were covered with a sloping roof and not with a dome.
After the conclusion of the peace of Nicias (421 B.C.) he marched against the Argives in defence of Epidaurus, and after skilful manoeuvring surrounded the Argive army, and seemed to have victory within his grasp when he unaccountably concluded a four months' truce and withdrew his forces.
A copy of the Diadumenos of Polyclitus from Delos, and temple sculptures from Epidaurus and the Argive Heraeum, are among the more notable of its recent acquisitions.