History of the Peloponnesian War

In the first place the Lacedaemonians sent ambassadors, and ordered the Athenians to drive out the pollution of the goddess; which pollution was of the following nature.

There was one Cylon, a man who had conquered at the Olympic games, an Athenian of the olden time, both noble and powerful; he had married a daughter of Theagenes, a Megarean, who at that time was tyrant of Megara.