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Heros of Oylmpus
Only God knows. I guess if someone went to mount oylmpus and dug up they may find out!?!?!
It depends upon which Greek god/goddess and Demigod; and if the child of 'the Big Three' Hades/Zeus/Poseidon was born of mortal woman or goddess.
The Greek myths are so old that all we know is that they originated in Ancient Greece. No one knows who invented them, or if they are real, for that matter -- what we call their mythology was their religion (basically).
* Zeus or Jupiter, * Apollo or Phoebus, * Ares or Mars, * Hermes or mercury, * pOSEIDON OR nEPTUNE, * HEPHAESTUS or Vulcan, * Hades or Pluto, * eROS or CuPId, * Artemis or Diana, * Athena or Minerva, * Aphrodite or Venus, * Hera or Juno, * hestia or vesta.