Themisto (daughter of Inachus)
Mother of Arcas in Greek mythology
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In Greek mythology, Themisto (/θəˈmɪstoʊ/; Ancient Greek: Θεμιστώ, romanized: Themistṓ, lit. 'belonging to the law or customs'[1]) was the daughter of the river god Inachus[2] and the mother of Arcas by Zeus[3]; she was transformed into a bear by Hera.[4]
In other accounts, the usual birth mother of Arcas was called Callisto, daughter of Lycaon or else Megisto, daughter of Ceteus,[5] both women were members of the Arcadian royal family.