Later Cleomenes' treacherous plot against Demaratus became known; he was seized with fear of the Spartans and secretly fled to Thessaly. From there he came to Arcadia and stirred up disorder, uniting the Arcadians against Sparta; among his methods of binding them by oath to follow him wherever he led was his zeal to bring the chief men of Arcadia to the city of Nonacris and make them swear by the water of the Styx. Near this city is said to be the Arcadian water of the Styx, and this is its nature: it is a stream of small appearance, dropping from a cliff into a pool; a wall of stones runs round the pool. Nonacris, where this spring rises, is a city of Arcadia near Pheneus.