A Dictionary of Greek and Roman biography and mythology

1. The Boeotian, the most celebrated of them, was believed to have lived and given his oracles at Heleon in Boeotia, being inspired by the nymphs of the Corycian cave. His oracles were held in high esteem, and, from the specimens we still possess in Herodotus and Pausanias, we see that, like the Delphic oracles, they were composed in hexameter verse. (Paus. 4.27.2, 9.17.4, 10.12.6, 14.3, 32.6; Hdt. 8.20, 77, 9.43; Aristoph. Peace 1009 with the Schol., Equit. 123, Av. 907.) From these passages it seems evident, that in Boeotia Bacis was regarded as an ancient prophet, of whose oracles there existed a collection made either by himself or by others, similar to the Sibylline books at Rome; and, in fact, Cicero (de Divin. 1.18), Aelian (V.H. 12.25), Tzetzes (ad Lycoph,. 1278), and other writers, mention this Bacis always as a being of the same class with the Sibyls.