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.
Taking all these possibilities into consideration, therefore, and as a precaution against them, and acting consistently with his policy to reduce the Hellenes to an equality with each other, he sent for the Peloponnesians and gave them supplies, and concluded with them a a third treaty to the following effect:
"In the thirteenth year of the reign of Darius, while Alexippidas was ephor at Lacedaemon, an agreement was made in the plain of the Maeander by the Lacedaemonians and their allies with Tissaphernes, Hieramenes, and the sons of Pharnaces respecting the King's affairs and those of the Lacedaemonians and their allies. 1.
"The King's country, as much of it as is in Asia, shall be the King's; and concerning his own country the King shall determine as he pleases. 2.
"The Lacedaemonians and their allies shall not go against the country of the King to do any harm, nor the King against that of the Lacedaemonians or their allies to do any harm.