From Latin
Iuppiter, which was ultimately derived from the vocative form of Indo-European *
Dyēws-pətēr, composed of the elements
Dyēws (see
Zeus) and
pətēr "father". Jupiter was the supreme god in Roman
mythology. He presided over the heavens and light, and was responsible for the protection and laws of the Roman state. This is also the name of the fifth and largest planet in the solar system.