 The Sphinx is called "Phix" (Φίξ) by Hesiod in line 326 of the Theogony

The sphinx was the emblem of the ancient city-state of Chios, and appeared on seals and the obverse side of coins from the 6th century BCE until the 3rd century CE.The Sphinx is said to have guarded the entrance to the Greek city of Thebes, asking a riddle to travellers to allow them passage.The exact riddle asked by the Sphinx was not specified by early tellers of the myth, and was not standardized as the one given below until late in Greek history.