Maurus Servius Honoratus, Commentary on the Eclogues of Vergil 8.29
The wife of Dion, king of Laconia, was Iphitea, daughter of Prognaus, who had kindly received Apollo. In return Apollo rewarded her by conferring upon her three daughters (Orphe, Lyco, and Carya) the gift of prophecy on condition, however, that they should not betray the Gods nor search after forbidden things. Afterwards Bacchus also came to the house of Dion; he was not only well received, like Apollo, but won the love of Carya, and therefore soon paid Dion a second visit, under the pretext of consecrating a temple, which the king had erected to him. Orphe and Lyco, however, guarded their sister, and when Bacchus had reminded them, in vain, of the command of Apollo, they were seized with raging madness, and having gone to the heights of Taygetus, they were metamorphosed into rocks. Carya, the beloved of Bacchus, was changed into a walnut tree, and the Lacedaemonians, on being informed of it by Artemis, dedicated a temple to Artemis Caryatis.

Vergil, Georgics 2.487
Taygetus, where Spartan girls hold Bacchic rites!