Sibyl rock is an outcropping of rock on the site of Delphi, standing just to the south of the Polygonal Wall.
Pausanias, a visitor to the site in the 2nd century CE, writes in his travel log: There is a rock rising up above the ground. On it, say the Delphians, there stood and chanted the oracles a woman, by name Herophile and surnamed Sibyl. The former Sibyl I find was as ancient as any; the Greeks say that she was a daughter of Zeus by Lamia, daughter of Poseidon, that she was the first woman to chant oracles, and that the name Sibyl was given her by the Libyans.[1]