Histories
Herodotus
Herodotus. Godley, Alfred Denis, translator. Cambridge, MA; London: Harvard University Press; William Heinemann, Ltd., 1920-1925 (printing).
Artaphrenes, learning all that was afoot, bade Hermippus carry Histiaeus' letters to those for whom he was bringing them, and give him those which the Persians sent in answer to Histiaeus. Thus these men became known, and then Artaphrenes put many Persians to death.