The Thriae were three prophetic nymphs, gifted with wings, who lived Mount Parnassus and by whom Apollo was reared. They were credited with the invention of the art of prophecy by means of pebbles (θριαί) which were thrown into an urn. They instructed Hermes in this art.
- Aken, Dr. A.R.A. van. (1961). Elseviers Mythologische Encyclopedie. Amsterdam: Elsevier.
- Homeric Hymns. Hymn to Hermes, 552.
- Scholiast on Callimachus' Hymn to Apollo, 45.
- Smith, William. (1870). Dictionary of Greek and Roman Antiquities.