Sleeping Princess (ねむり姫, Nemuri Hime) is a diamond that was kept in the Devil's Castle.
5,000 years before the events of the movie, the Sleeping Princess becomes dormant.
The demon Lucifer wants to use this diamond to power a cannon in his Devil's Castle in order to destroy the Sun. Unaware of the fact that the Sleeping Princess is a jewel, Master Roshi sends Goku and Krillin to retrieve it, thinking it is a pretty girl.
Video Game Appearance
The Sleeping Princess and the events of the film in which it appears are mentioned in a Dragon Ball History entry in Dragon Ball Fusions.
In Dragon Ball Z: Dokkan Battle, the Sleeping Princess is a Treasure Item that can be traded for certain items at Baba's Shop. It can be obtained from the Story Event "Sleeping Princess in Devil's Castle" in the stage "Sleeping Princess".