The planet Mercury is the official ruler of Virgo, of course, but according to the Roman astrologer Manilius, the deity (as opposed to the planet) that rules the sign is Ceres, goddess of the corn. Click here for more on this.
Ceres is the Roman version of Demeter who is a Greek personification of the Great Mother herself.
Make of that what you will. Anyway, it’s got to be somebody’s mother’s birthday!