Antigonus, then, having got Acrocorinthus into his power, as I have said, kept it under guard, putting men there whom he most trusted, and making Persaeus the philosopher their commander. Now Aratus, even while Alexander was still living, had set his hand to the enterprise, but an alliance was made between the Achaeans and Alexander, and he therefore desisted. At the time of which I speak, however, a new and fresh basis for the enterprise was found by him in the following circumstances. There were in Corinth four brothers, Syrians by race, one of whom, Diodes by name, was serving as a mercenary soldier in the citadel. The other three, after stealing some gold plate of the king’s, came to Aegias, a banker in Sicyon with whom Aratus did business. A portion of the gold they disposed of to him at once, but the remainder was being quietly exchanged by one of them, Erginus, in frequent visits.