A Dictionary of Greek and Roman biography and mythology

(Ἁγνώ) an Arcadian nymph, who is said to have brought up Zeus. On Mount Lycaeus in Arcadia there was a well sacred to and named after her. When the country was suffering from drought, the priest of Zeus Lycaeus, after having offered up prayers and sacrifices, touched the surface of the well with the branch of an oak tree, whereupon clouds were formed immediately which refreshed the country with rain. The nymph Hagno was represented at Megalopolis carrying in one hand a pitcheri and in the other a patera. (Paus. 8.38.3, 31.2, 47.2.)

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