Explanation:
One of the hidden benefits of studying Greek myths is to explore virtues. With the classic stories, the lines between righteous and immoral behavior are clear cut, so that even young children can recognize examples of the 4 cardinal virtues: prudence, justice, fortitude and temperance.
Myth of the legendary Odysseus. ...
Myth of Jason and the Argonauts. ...
Myth of Theseus, the legendary king of Athens. ...
The Amazons. ...
Persephone, the Queen of the Underworld. ...
Prometheus, the friend of man. ...
Myth of the fall of Icarus. ...
Perseus and Andromeda.
As others have said, according to Hesiod the oldest one that existed was Chaos, and then Earth came to be. According to Orpheus though, originally there was an Egg out of which the Universe came, but before the Universe, Eros (Love) came out of it, making Love the oldest one.