Pausanias 9.29 (2nd Century AD) treats obscure source material already obsolete in his own day. Citing the Atthis by Hegesinus — a poem no longer extant for Pausanias but cited by Callippus of Corinth (whose history of Orchomenus is no longer extant for us) — Pausanias records that anciently a group of three Boeotian Muses was venerated on Mt Helicon. These were displaced by a cult of nine Muses.