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.
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.
When these forces had been thus disposed, the Four Hundred, each carrying a concealed dagger and accompanied by the one hundred and twenty young men whom they made use of wherever there was any need of their handiwork, broke in upon the regular senators who were in the senate-chamber, and told them to get their pay[*](A drachma each day; see Boeckh, Pub. Econ. Ath., i. 327. For that day they took their pay from the regular official; For the rest of the month the 400 paid it to them.) and go out; and they themselves brought them their pay for all the remainder of their term, and as they went out gave it to them.
When in this manner the senate had quietly withdrawn without making any opposition, and the citizens at large raised no disturbance but kept quiet, the Four Hundred entered the senate-chamber and for the present chose by lot prytanes[*](They were proceeding in the constitutional way. In the regular βουλὴ, the ten tribes took in turn the πρυτανεία or executive control of public affairs for one-tenth of the year (about thirty-five days). The prytanes would have been now forty in number instead of fifty as usual, as the new council consisted of forty from each tribe (Aristot. Ἀθ. Πολ., ch. xxxi.).) from their own number, and with respect to the gods observed all the usual rites of prayers and sacrifices as they assumed office. Afterwards, however, they departed widely from the democratic manner of administration —except that they did not recall the exiles, because of Alcibiades—and in general governed the city in a high-handed way.