History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
About this time the Lacedaemonians founded their colony of Heraclea in Trachis, their object being the following.
The Malians form in all three tribes, the Paralians, the Hiereans, and the Trachinians. The last of these having suffered severely in a war with their neighbors the Oetaeans, at first intended to give themselves up to Athens; but afterwards fearing not to find in her the security that they sought, sent to Lacedaemon, having chosen Tisamenus for their ambassador.