Proto-Italic language in the context of "Jupiter (god)"

In ancient Roman religion and mythology, Jupiter (Latin: Iūpiter or Iuppiter, from Proto-Italic *djous "day, sky" + *patēr "father", thus "sky father" Greek: Δίας or Ζεύς), also known as Jove (nom. and gen. Iovis [ˈjɔwɪs]), is the god of the sky and thunder, and king of the gods. Jupiter was the chief deity of Roman state religion throughout the Republican and Imperial eras, until Christianity became the dominant religion of the Empire. In Roman mythology, he negotiates with Numa Pompilius, the second king of Rome, to establish principles of Roman religion such as offering, or sacrifice.

Jupiter is thought to have originated as a sky god. His identifying implement is the thunderbolt and his primary sacred animal is the eagle, which held precedence over other birds in the taking of auspices and became one of the most common symbols of the Roman army (see Aquila). The two emblems were often combined to represent the god in the form of an eagle holding in its claws a thunderbolt, frequently seen on Greek and Roman coins. As the sky god, he was a divine witness to oaths, the sacred trust on which justice and good government depend. Many of his functions were focused on the Capitoline Hill, where the citadel was located. In the Capitoline Triad, he was the central guardian of the state with Juno and Minerva. His sacred tree was the oak.

Old Latin, also known as Early, Archaic or Priscan Latin (Classical Latin: prīsca Latīnitās, lit. 'ancient Latinity'), was the Latin language in the period roughly before 75 BC, i.e. before the age of Classical Latin. A member of the Italic languages, it descends from a common Proto-Italic language; Latino-Faliscan is likely a separate branch from Osco-Umbrian. All these languages may be relatively closely related to Venetic and possibly further to Celtic (see the Italo-Celtic hypothesis).

The use of "old", "early" and "archaic" has been standard in publications of Old Latin writings since at least the 18th century. The definition is not arbitrary, but the terms refer to spelling conventions and word forms not generally found in works written under the Roman Empire. This article presents some of the major differences.