sibyl (sĭbˈĭl) [key], in classical mythology and religion, prophetess. There were said to be as many as 10 sibyls, variously located and represented. The most famous was the Cumaean sibyl, described by Vergil in the Aeneid. When she offered Tarquin her prophetic writings, the so-called sibylline books, he refused to pay her high price. She kept burning the books until finally he bought the remaining three at the original price. Although the historical origins of the books are uncertain, they were actually kept at Rome in the Capitol and were consulted by the state in times of emergency. The books were destroyed in the burning of the Capitol in 83 B.C., but a new collection was made. This was burned in A.D. 405. The sibyls achieved a stature in Christian literature and art similar to that of the Old Testament prophets.