Sorry, but I don't think "Panethia" is a person or thing in Ancient Greece, or even myth. You might be thinking one of severalthings: Athena, the goddess of warfare, wisdom, and weaving; the word "pantheon" which describes a group of gods, be it Greek, Egyptian, or what have you; the Parthenon, a temple complex on the Athenian acropolis; or you might be thinking of Panaethia, a genus of moth.
Sorry.