History of the Peloponnesian War
Thucydides
Thucydides. The English works of Thomas Hobbes of Malmesbury. Hobbes, Thomas. translator. London: John Bohn, 1843.
They had information farther that he had in hand some practice with the Helots. And so he had, for he promised them not only manumission but also freedom of the city if they would rise with him and co-operate in the whole business.