History of the Peloponnesian War

This was no mere calumny, there being really some such plan entertained by the accused. Their first wish was to have the oligarchy without giving up the empire; failing this to keep their ships and walls and be independent; while, if this also were denied them, sooner than be the first victims of the restored democracy, they were resolved to call in the enemy and make peace, give up their walls and ships, and at all costs retain possession of the government, if their lives were only assured to them.

For this reason they pushed forward the construction of their work with posterns and entrances and means of introducing the enemy, being eager to have it finished in time.

Meanwhile the murmurs against them were at first confined to a few persons and went on in secret, until Phrynichus, after his return from the embassy to Lacedaemon, was laid wait for and stabbed in full market by one of the Peripoli, falling down dead before he had gone far from the council chamber. The assassin escaped; but his accomplice, an Argive, was taken and put to the torture by the Four Hundred, without their being able to extract from him the name of his employer, or anything further than that he knew of many men who used to assemble at the house of the commander of the Peripoli and at other houses. Here the matter was allowed to drop. This so emboldened Theramenes and Aristocrates and the rest of their partisans in the Four Hundred and out of doors, that they now resolved to act.