History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
Phrynichus also showed himself beyond all others most zealous for the oligarchy, through fear of Alcibiades and the certainty that Alcibiades was aware of all the intrigues[*](cf. chs. l. and li.) he had carried on at Samos with Astyochus; for he thought that in all probability Alcibiades would never be recalled by an oligarchical government; and when face to face with dangers, after he had once set to work, he proved himself a man who could quite be depended upon.
Theramenes also, the son of Hagnon, was foremost among those who attempted to overthrow the democracy, being a man of no small capacity either in speech or in judgment. Consequently, conducted as it was by many able men, the plot not unnaturally succeeded, even though it was an arduous task; for it was difficult, after the lapse of almost one hundred years[*](Really 99 years: from 510 to 411.) since the tyrants had been overthrown, to deprive of their liberty the Athenian people, who had been, not only not subject to anyone else, but for more than half of that period had themselves been accustomed to rule over others.
When the assembly had been dissolved, with no opposition from anyone and immediately after sanctioning these measures, the leaders of the oligarchy then introduced the Four Hundred into the senate-chamber in the following manner: all the Athenians were at all times under arms, as a precaution against the enemy at Deceleia, some on the walls and some in the ranks.
On that day, then, they let those who were not privy to their design go away as usual, but those who were in the conspiracy had been quietly told to remain, not close by their arms, but at some distance from them, and if anybody tried to oppose what was going on, to take their arms and permit no interference.
And there were at hand some Andrians and Tenians and three hundred Carystians and some of their colonists from Aegina,[*](In 431 B.C.; cf. ii. 27.) whither they had been sent by the Athenians to inhabit the island, who had come for this very purpose in their own armour, and to these the same order had already been given.