Neptune (SMCU)

Neptune is the eighth planet from the Sun in the Solar System. It is one of the Solar System's four gas giants and the fourth largest planet.

It is discovered in 1846 and was named after the Roman god of the sea. Neptune has 14 moons, and the largest of them is Triton, where Triton Castle is located.

In the Sailor Moon Cinematic Universe
Neptune is protected by Princess Neptune.