History of the Peloponnesian War
Thucydides
Thucydides. History of the Peloponnesian War. Crawley, Richard, translator. London and Toronto: J. M. Dent and Sons Ltd.; New York: E. P. Dutton and Co., 1914.
Besides, they were informed that he was even intriguing with the Helots; and such indeed was the fact, for he promised them freedom and citizenship if they would join him in insurrection, and would help him to carry out his plans to the end.