History of the Peloponnesian War

Theramenes, son of Hagnon, was also one of the foremost of the subverters of the democracy—a man as able in council as in debate. Conducted by so many and by such sagacious heads, the enterprise, great as it was, not unnaturally went forward; although it was no light matter to deprive the Athenian people of its freedom, almost a hundred years after the deposition of the tyrants, when it had been not only not subject to any during the whole of that period, but accustomed during more than half of it to rule over subjects of its own.

The assembly ratified the proposed constitution, without a single opposing voice, and was then dissolved; after which the Four Hundred were brought into the council chamber in the following way. On account of the enemy at Decelea, all the Athenians were constantly on the wall or in the ranks at the various military posts.

On that day the persons not in the secret were allowed to go home as usual, while orders were given to the accomplices of the conspirators to hang about, without making any demonstration, at some little distance from the posts, and in case of any opposition to what was being done, to seize the arms and put it down.