Strabo, Geography

Ceos was at first a Tetrapolis, but only two cities are left, Iulis and Carthaea, into which the remaining two were incorporated, Poeëessa into Carthaea and Coressia into Iulis. Both Simonides the melic poet and his nephew Bacchylides were natives of Iulis, and also after their time Erasistratus the physician, and Ariston the peripatetic philosopher and emulator of Bion the Borysthenite. It is reputed that there was once a law among these people (it is mentioned by Menander,“Phanias, the law of the Ceians is good, that he who is unable to live well should not live wretchedly
”), which appears to have ordered those who were over sixty years of age to drink hemlock, in order that the food might be sufficient for the rest. And it is said that once, when they were being besieged by the Athenians, they voted, setting a definite age, that the oldest among them should be put to death, but the Athenians raised the siege. The city lies on a mountain, about twenty-five stadia distant from the sea; and its seaport is the place on which Coressia was situated, which has not as great a population as even a village. Near Coressia, and also near Poeëessa, is a temple of Sminthian Apollo; and between the temple and the ruins of Poeëessa is the temple of Nedusian Athena, founded by Nestor when he was on his return from Troy. There is also a River Elixus in the neighborhood of Coressia.