InGreek mythology,Themisto (/θəˈmɪstoʊ/;Ancient Greek:Θεμιστώ,romanized: Themistṓ,lit. 'belonging to the law or customs'[1]) was the daughter of theriver godInachus and the mother ofArcas byZeus; she was transformed into a bear byHera.[2]
In other accounts, the usual birth mother of Arcas was calledCallisto, daughter ofLycaon or elseMegisto, daughter ofCeteus,[3] both women were members of theArcadian royal family.
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