Virgo is also associated with the Greco-Roman god Hermes / Mercury , and sometimes the goddesses Athena / Minerva , Demeter / Ceres , Astraea, Eris / Discordia , Ate . and Hestia / Vesta , and the gods Hephaestus / Vulcan , Loki , Asklepios / Aesculapius , and Veles