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At the oracle of Dodona, she is called Diōnē (the feminine form of Diós, genitive of Zeus; or of dīos, "godly", literally "heavenly"), who represents the earth-fertile soil, probably the chief female goddess of the proto-Indo-European pantheon[citation needed]. Python, daughter (or son) of Gaia was the earth dragon of Delphi represented as a serpent and became the chthonic deity, enemy of Apollo, who slew her and possessed the oracle.[4]