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There was one assigned to each of the seven planetary powers and to each day of the week, they shared each position with a brother. In order of their day of the week they were: Theia and the Sun (illumination), Phoebe and the Moon (enchantment), Dione and Mars (growth), Metis and Mercury (wisdom), Themis (see above) and Jupiter (justice), Tethys (see above) and Venus (love), and Rhea (see above) and Jupiter (peace). They existed before the Olympian Gods (like Zeus, Hera, Athena, etc. ), and were co-opted into that culture as mothers of minor.
UPDATE | Mother of minor stabbed says she's not pressing charges Updated: Wed 12:57 PM, Sep 30, 2015.