||Uranus, was the primal Greek god personifying the sky. His equivalent in Roman mythology was Caelus. In Ancient Greek literature, according to Hesiod in his Theogony, Uranus or Father Sky was the son and husband of Gaia, Mother Earth.
The ancient Greeks and Romans knew of only five 'wandering stars': Mercury, Venus, Mars, Jupiter, and Saturn. Following the discovery of a sixth planet in the 18th century, the name Uranus was chosen as the logical addition to the series: for Mars was the son of Jupiter, Jupiter the son of Saturn, and Saturn the son of Uranus.