The naiad-nymph, a daughter of Achelous who inhabited the Castalian spring in Delphi.
In older traditions, Castalian spring already existed by the time Apollo came to Delphi searching for Python.
According to some, the water was a gift to Castalia from the river Cephisus.
Castalia could inspire the genius of poetry to those who drank her waters or listened to their quiet sound; the sacred water was also used to clean the Delphian temples.
Apollo consecrated Castalia to the Muses.
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