Pausanias wrote in his work, “Description of Greece” 8. 42. 1 (trans. Jones) (Greek travelogue C2nd A.D.) :

“They say [Demeter], angry with Poseidon and grieved at the rape of Persephone, put on black apparel and shut herself up in this cavern [in Arkadia] for a long time . . . [and] all the fruits of the earth were perishing, and the human race dying yet more through famine.”