History of the Peloponnesian War

Therefore, on the day appointed, they suffered such as knew not their intent to go forth as they were wont. But to such as were of the conspiracy they quietly gave order not to go to the camp itself but to lag behind at a certain distance, and if any man should oppose what was in doing, to take arms and keep them back.

They to whom this charge was given were [the] Andrians, Tenians, three hundred Carystians, and such of the colony of Aegina which the Athenians had sent thither to inhabit, as came on purpose to this action with their own arms.

These things thus ordered, The Four Hundred, with every man a secret dagger, accompanied with one hundred and twenty young men of Greece, whom they used for occasions of shedding of blood, came in upon the Counsellers of the Bean as they sat in the council-house and commanded them to take their salary and be gone, which also they brought ready with them, for the whole time they were behind, and paid it to them as they went out.

And the rest of the citizens mutinied not, but rested quiet. The Four Hundred, being now entered into the councilhouse, created Prytanes amongst themselves by lot, and made their prayers and sacrifices to the gods, all that were before usual at the entrance upon the government.

And afterwards receding far from that course which in the administration of the state was used by the people, saving that for Alcibiades' sake they recalled not the outlaws, in other things they governed the commonwealth imperiously, and not only slew some, though not many, such as they thought fit to be made away, and imprisoned some, and confined others to places abroad, but also sent heralds to Agis, king of the Lacedaemonians, who was then at Deceleia, signifying that they would come to composition with him, and that now he might better treat with them than he might before with the unconstant people.