Timoleon
Plutarch
Plutarch. Plutarch's Lives, Vol. VI. Perrin, Bernadotte, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1918.
But while Timoleon was getting ready for his voyage and collecting soldiers, a letter was brought to the Corinthians from Hicetas which disclosed his treacherous change of sides.
For as soon as he had sent out the embassy, he openly attached himself to the Carthaginians and acted with them in order to expel Dionysius from Syracuse and become its tyrant himself.
And fearing lest his opportunities for action should escape him if a general and an army came from Corinth in advance, he sent a letter to the Corinthians telling them that there was no need of their putting themselves to the trouble and expense of a voyage to Sicily with all its perils,
especially since the Carthaginians, with whom their delay had forced him to make an alliance against the tyrant, forbade their expedition and were on the watch for it with a large fleet.