The Roman name for Zeus is Jupiter. Jupiter is also the name of largest planet in the solar system, and suitably, in Greek mythology, Zeus was the most powerful god among the Olympians.
Zeus sired the famous heroes, Heracles and Perseus, and he always carried with him his favorite weapon, the thunderbolt. Ancient Greeks believed that lightning and thunder were manifestations of the wrath of Zeus.
The Romans considered Jupiter as the equivalent of Zeus, making Jupiter the chief deity of their empire's religion. Jupiter ruled the skies as the king of the gods, while his brothers Neptune and Pluto commanded the waters and the underworld.