According to Graves, Cerdo (‘gain or ‘art’) is one of Demeter's titles; it was applied to her as weasel, or vixen, for both are considered prophetic animals.[7]
^Graves, Robert (1960). The Greek Myths. Harmondsworth, London, England: Penguin Books. pp. s.v. The Birth of Heracles. ISBN978-0143106715.
^Pausanias, 2.21.1: “Having descended thence, and having turned again to the market-place, we come to the tomb of Cerdo, the wife of Phoroneus, and to a temple of Asclepius.”