More than a hundred years ago the Greeks believed in many gods: Cronos (Kronos), Gaia, Zeus, Poseidon, Athena, Hades, etc.
The stories of Pandora’s box, the Titans, and the underworld all came from Greek mythology. The Greeks believed that Zeus (God of the sky) was the ruler of all the gods, and one of the most powerful. The three main gods include Zeus, Poseidon, and Hades, as they are Cronos’ male children.
Greek myths are unrealistic. For example, Athena was just a thought in Zeus’ head, that became real! Also, all the olympians and Titans are related to each other, yet they’re enemies.
In addition to Greek myths, there is also Roman mythology. Roman mythology is relatively close to Greek mythology. There are minor differences, like their names, and that Poseidon was hated for being the god of earthquakes. Either way, both mythologies are very interesting.