Which planet was the king of the gods in roman mythology?

Jupiter, King of the Roman gods, is represented as.. well... Jupiter. Mercury, Venus, Mars, Neptune, and Pluto are known in Greece in this order as Hermes, Aphrodite, Ares, Poseidon, and Hades are the Greek versions of these. Earth is not a god but as a titan called, Gaea: Mother Earth. Jupiter's other self is Zeus.