Saturn and Jupiter, Chronos and Zeus

The mythological character Saturn has countless associations and manifestations in different mythological systems. For the Romans, he was a harvest god. It's not hard to see how that gets generalized to a god of time, and associated with death, and in a world governed by cycles, a god of rebirth. It seems like this character is the Egyptian Osiris, and there are obvious associations with the Christian Jesus (see John Barleycorn).

A harvest and time god is also a god of systems and accounting--measuring. In that role, he becomes an intermediary with what's real--the sun is stored in the grain and the beer. The grain can only be doled out in a manner that counterfeits the abundance of growing living plants of an endless summer. The beer can only be served by the pint and by the keg. In that role he becomes a phony, fake. In the dark of winter, in the underworld, fire is a feeble red imitation of the sun. He's the king of that fake world. In some cases a benevolent king--Good King Wenceslas. In some cases he's a missing, or injured (castrated) king. (cf tale of King Arthur--the Fisher King [a underworld/water king])

Zeus overthrows Chronos--Saturn as a degenerate tyrant who ate his children. Zeus is spared with the help of his mother Rhea who tricks Chronos into eating a rock instead of her boy. (a theme that shows up again and again--male child(ren) hidden from a murderous tyrant: Moses, Jesus, Romulus and Remus, Horus, Luke and Leia, etc... etc...) There are several possible interpretations of what these stories mean, but they're probably either seasonal or astromythological.

When Zeus escapes, he takes command of the universe. He's harsh, authoritarian, but possibly orderly versus the chaos and degeneracy of Chronos.