History of the Peloponnesian War

For he and Hippocrates were engaged in negotiations about affairs in Boeotia, at the instance of certain men in several cities who wished to bring about a change in their form of government and to transform it into a democracy, such as the Athenians had. The leading spirit in these transactions was Ptoeodorus, an exile from Thebes, through whom Demosthenes and Hippocrates had brought about the following state of affairs.

Siphae, a town on the shore of the Crisaean Gulf in the territory of Thespiae, was to be betrayed by certain men; and Chaeronea, a city which is tributary to Orchomenus—the city which was formerly called Minyan, but is now called Boeotian—was to be put into the hands of the Athenians by others, the fugitives from Orchomenus, who also took into their pay some Peloponnesians, being especially active in the conspiracy. Some Phocians also had a share in the plot, Chaeronea being on the borders of Boeotia, and adjacent to Phanotis, which is in Phocis.