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Artemis (seated and wearing a radiate crown), the beautiful nymph Callisto (left), Eros and other nymphs. Antique fresco from Pompeii.
In Greek mythology, Callisto (/kəˈlɪstoʊ/; Ancient Greek: Καλλιστώ, romanized: Kallistṓ, lit. 'most beautiful' Ancient Greek pronunciation: [kallistɔ̌ː]) was a nymph (an Arcadian mountain nymph; an Oread), or the daughter of King Lycaon; the myth varies in such details. She was believed to be one of the followers of Artemis (Diana for the Romans) who attracted Zeus. Many versions of Callisto's story survive. According to some writers, Zeus transformed himself into the figure of Artemis to pursue Callisto, and she slept with him believing Zeus to be Artemis.