In Greek mythology, Erato (; The name derives from the ancient Greek word eratos, meaning lovely or longed-for.) was a dryad. She was the priestess and prophetess of the god Pan, verses were attributed to her at an ancient oracle of the god, located at Megalopolis near Acacesium., p. 107. Erato was married to Arcas, the son of Zeus and Callisto, and bore him three sons, Azan, Apheidas, and Elatus.Pausanias, 8.4.2, 37.11 & 37.12

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References

Pausanias, Description of Greece with an English Translation by W.H.S. Jones, Litt.D., and H.A. Ormerod, M.A., in 4 Volumes. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1918. . Online version at the Perseus Digital Library Pausanias, Graeciae Descriptio. 3 vols. Leipzig, Teubner. 1903. Greek text available at the Perseus Digital Library.