CIMMERIUM, in Ancient Geography, a place near Baie, in Campania, where formerly stood the cave of the sibyl. The people were called Cimmerii, who living in subterraneous habitations, from which they issued in the night to commit robberies and other acts of violence, never saw the light of the sun (Homer). To give a natural account of this fable, Festus says, there was a valley surrounded with a pretty high ridge, which precluded the morning and evening sun.