In Greek legend, a Phoenician from Tyre, brother of Europa. He founded the city of Thebes in Greece. Obeying the oracle of Athena, Cadmus killed the sacred dragon that guarded the spring of Ares. He sowed the teeth of the dragon, from which sprang a multitude of fierce warriors who fought among themselves; the survivors were considered to be the ancestors of the Theban aristocracy.
Cadmus married Harmonia and was credited with the introduction of the (Phoenician) alphabet into Greece.