In Greek mythology, the Roman name for Zeus, king of the Olympian gods, was Jupiter.
Jupiter was the chief deity of Roman religion and the closest Roman counterpart to Zeus. Both gods ruled the sky, controlled thunder and lightning, and presided over divine and human order. Their names were often paired by ancient writers comparing Greek and Roman traditions.
The Roman name is also written Iuppiter in Latin. The planet Jupiter received its name from this Roman god because it appeared exceptionally bright and prominent in the ancient sky. Zeus and Jupiter were not originally the same figure in separate languages, but Roman authors increasingly identified Roman gods with Greek equivalents.
A common mix-up is confusing Jupiter with Neptune, the Roman counterpart of Poseidon, or Mars, the counterpart of Ares. Jupiter's sacred symbols included the eagle, oak, and thunderbolt.