This name derives from the Pie (Proto Indo-European) and Latin “*djew > iou-pater > iŏvis > iuppĭtĕr”, meaning “supreme god”. Jupiter is the king of the gods and the god of sky and thunder. Jupiter was the chief deity of Roman state religion throughout the republican and imperial eras, until the empire came under Christian rule. Jupiter was the son of Saturn (Cronos in Greek mythology). Saturn, who was the previous king of the gods, began to swallow the children that he had with his wife, ops (Greek equivalent Rhea), when they were born. This was because he had been warned that one of his children would overthrow him. Jupiter and his brothers divided the universe into three parts, Jupiter obtaining the heavens, Neptune the sea and Pluto the underworld. This is how Jupiter became the king of the gods. In Latin “Jovis dies” is the day of Jupiter (English: Thursday), from the Proto-Germanic counterpart “thunraz” (god of thunder).