Neptune, the eighth and farthest planet from the Sun, has had a variety of names and nicknames since its discovery in 1846. It was initially referred to as "Le Verrier's planet" as Urbain Le Verrier first observed the planet.
Johann Galle, a noted 19th century astronomer, recommended it be referred to as "the planet exterior to Uranus." The names Janus and Oceanus were also suggested prior to the adoption of the name Neptune, which refers to the Roman god of the ocean. The Greek equivalent of this deity was Poseidon. The planet is also sometimes known as "The Last of the Gas Giants" as it is the last of this type of planet in the Solar System.