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.
of the Athenians. Being then in such perplexity and fearing lest they might have war at once with the Lacedaemonians and Tegeates, the Boeotians and the Athenians, the Argives, who before this had not accepted the treaty with the Lacedaemonians but proudly hoped to have the hegemony of the Peloponnesus, now sent to Lacedaemon in all haste two envoys, Eustrophus and Aeson, who seemed likely to be most acceptable to them, thinking it best under the present circumstances to make a treaty with the Lacedaemonians in whatever way might be feasible and to have quiet.
On their arrival their envoys made proposals to the Lacedaemonians as to the terms on which the treaty should be concluded.
At first the Argives claimed that they should be allowed to submit to the arbitration of some city or private person the matter of the Cynurian territory—a district containing the towns of Thyrea and Anthene and occupied by the Lacedaemonians—which being border ground they were always disputing about. Afterwards, however, although the Lacedaemonians would not permit them to make mention of that district, but said that, if they wished to make a treaty on the same terms as before, they were ready to do so, the Argive envoys did induce the Lacedaemonians to agree to the following terms: for the present that a treaty should be made for fifty years; that, however, either Lacedaemon or Argos, provided there were at the time neither pestilence nor war in either place, might challenge the other to decide by battle the question about this territory—just as once before,[*](550 B.C.; cf. Hdt. I. lxxxii.) when each had claimed to be victorious—but pursuit must not be made beyond the boundaries, between Argos and Lacedaemon.