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Cadmus came in the course of his wanderings to Delphi, where he consulted the oracle. He was ordered to give up his quest and follow a special cow, with a half moon on her flank, which would meet him, and to build a town on the spot where she should lie down exhausted. The cow was given to Cadmus by Pelagon, King of Phocis, and it guided him to Boeotia, where he founded the city of Thebes. Intending to sacrifice the cow to Athena, Cadmus sent some of his companions to the nearby Castalian Spring, for water. They were slain by the spring's guardian water-dragon, which was in turn destroyed by Cadmus. By the instructions of Athena, he sowed the dragon's teeth in the ground, from which there sprang a race of fierce armed men, called the Spartoí ("sown"). By throwing a stone among them, Cadmus caused them to fall upon one another until only five survived, who assisted him to build the Cadmeia or citadel of Thebes, and became the founders of the noblest families of that city.

(retirado daqui)

imagem: Maxfield Parrish, Cadmo Semeando os Dentes do Dragão.
Ilustração para uma edição de 1908 de A Wonder-Book &
Tanglewood Tales, de Nathaniel Hawthorne.