Aratus

He also made Ptolemy an ally of the Achaeans, with the leadership in war on land and sea. And he was so influential among the Achaeans that, since it was not permissible every year, they chose him general every other year, though, in fact, his wisdom made him their leader all the time. For they saw that he put first and foremost, not wealth, not fame, not friendship with kings, not his own native city’s advantage, but only the growth in power of the Achaean League.

For he considered that the Greek states which were weak would be preserved by mutual support when once they had been bound as it were by the common interest, and that just as the members of the body have a common life and breath because they cleave together in a common growth, but when they are drawn apart and become separate they wither away and decay, in like manner the several states are ruined by those who dissever their common bonds, but are augmented by mutual support, when they become parts of a great whole and enjoy a common foresight.

And so, since he saw that the best of the neighbouring peoples were autonomous, and was distressed at the servitude of the Argives, he plotted to kill Aristomachus the tyrant of Argos, being ambitious to restore its freedom to the city as a reward for the rearing it had given him, as well as to attach it to the Achaean League.

Accordingly, men were found to dare the deed, of whom Aeschylus and Charimenes the seer were the chief. They had no swords, however, the tyrant having prohibited the possession of them under heavy penalties. Aratus, therefore, ordered small daggers to be made for them in Corinth and sewed them up in pack-saddles; these he put upon beasts of burden carrying ordinary wares and sent them into Argos.