Count Hasimir Fenring is a fictional character in the Dune universe created by Frank Herbert. He is featured in the 1965 science fiction novel Dune by Frank Herbert, and is also a key character in the Prelude to Dune trilogy by Brian Herbert and Kevin J. Anderson. He later appears in the 2008 novel Paul of Dune, and the Caladan Trilogy (2020–2022).

The Spacing Guild is an organization in Frank Herbert's science fiction Dune universe that possesses a monopoly on interstellar travel and banking. Guild Navigators use the drug melange to achieve limited prescience, a form of precognition that allows them to successfully navigate "folded space" and safely guide enormous starships called heighliners across interstellar space instantaneously.