History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
But the land they confiscated and leased for ten years, and the Thebans occupied it. Indeed it was almost wholly for the sake of the Thebans that the Lacedaemonians in all their dealings with the Plataeans showed themselves so thoroughly hostile to them, thinking that the Thebans would be serviceable in the war then just beginning.
Such was the fate of Plataea, in the ninety-third year after they became allies of Athens.[*](519 B.C.)