While not exactly Greek (they are far older than any known civilization), they have inspired Greek and sometimes Roman myths.
Most of the Milky Way galaxy, which they call the Olympian Galaxy, is ruled by Zeus and his family.
Rule over the rest of the local universe is shared with his brothers Poseidon (who rules the Aegian Galaxy) and Hades (who rules the Stygian Galaxy, also called the Underworld).

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