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.

And so the allies who were there went back home, having brought these matters to a settlement, and so did the Athenian envoys later, after they had finished the business on which they had come.

This decision of the assembly, that the treaty had been broken, was made in the fourteenth year[*](445 B.c.) from the beginning of the thirty years' truce, which was made after the Euboean war.[*](Thuc. 1.114.)

And the vote of the Lacedaemonians that the treaty had been broken and tliat they must go to war was determined, not so much by the influence of the speeches of their allies, as by fear of the Athenians, lest they become too powerful, seeing that the greater part of Hellas was already subject to them.