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In page Io (mythology):

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In most versions of the legend, Io was the daughter of Inachus,[1][2] though various other purported genealogies are also known. If her father was Inachus, then her mother would presumably have been Inachus' wife (and sister), the Oceanid nymph Melia, daughter of Oceanus.[citation needed][a] She had the patronymic Inachis (Ἰναχίς) as daughter of Inachus.[3]