History of the Peloponnesian War

And envoys from Doris, the mother city of the Lacedaemonians, also took part in the embassy, making the same request, for they too were being ruined by the Oetaeans.

After hearing their appeal, the Lacedaemonians were of the opinion that they should send out the colony, wishing to aid both the Trachinians and the Dorians. At the same time, the site of the proposed city seemed to them well adapted for carrying on the war against Athens; for a fleet could be equipped there for an attack upon Euboea and the crossing thus made from a short distance away, and the place would also be useful for expeditions along the coast towards Thrace. In short, they were eager to found the settlement.

They therefore first consulted the god at Delphi, and at his bidding sent out the colonists, consisting of both Spartans and Perioeci,[*](The old inhabitants, chiefly of Achaean stock, who had been reduced to a condition of dependence (not slavery) by the Dorians.) and they invited any other Hellenes who so desired to accompany them, except Ionians and Achaeans and certain other races. The founders of the colony in charge of the expedition were three Lacedaemonians, Leon, Alcidas, and Damagon.

When they had established themselves they built a new wall about the city, which is now called Heracleia, and is about forty stadia distant from Thermopylae and twenty from the sea. They then proceeded to build dockyards, and in order that the place might be easy to guard fenced off the approach on the side toward Thermopylae by a wall across the pass itself.