in many godly and heroic offspring, including Athena ,  Apollo  and  Artemis ,  Hermes ,  Persephone  (by  Demeter ),  Dionysus ,  Perseus , Heracles ,  Helen of Troy ,  Minos , and the  Muses  (by  Mnemosyne ); by Hera, he is usually said to have fathered  Ares ,  Hebe  and  Hephaestus . [5]