Next to Geræstus is Eretria, which, after Chalcis, is the largest city in Eubœa. Next follows Chalcis, the capital as it were of the island, situated immediately on the Euripus. Both these cities are said to have been founded by Athenians before the Trojan war; [but it is also said that] after the Trojan war, Æclus and Cothus took their departure from Athens; the former to found Eretria, and Cothus, Chalcis. A body of Æolians who belonged to the expedition of Penthilus remained in the island. Anciently, even Arabians567 settled there, who came over with Cadmus.
These cities, Eretria and Chalcis, when their population was greatly augmented, sent out considerable colonies to Macedonia, for Eretria founded cities about Pallene and Mount Athos; Chalcis founded some near Olynthus, which Philip destroyed. There are also many settlements in Italy and Sicily, founded by Chalcidians. These colonies were sent out, according to Aristotle,568 when the government of the Hippobatæ, (or Knights,) as it is called, was established; it was an aristocratical government, the heads of which held their office by virtue of the amount of their property. At the time that Alexander passed over into Asia, they enlarged the compass of the walls of their city, including within them Canethus,569 and the Euripus, and erected towers upon the bridge, a wall, and gates.