History of the Peloponnesian War

And first the Lacedaemonians, by their ambassadors to the Athenians, required them to banish such as were under curse of the goddess Minerva for pollution of sanctuary. Which pollution was thus.

There had been one Cylon an Athenian, a man that had been victor in the Olympian exercises, of much nobility and power amongst those of old time, and that had married the daughter of Theagenes, a Megarean, in those days tyrant of Megara.

To this Cylon asking counsel at Delphi the God answered that on the greatest festival day he should seize the citadel of Athens.