The planet Giedi Prime is known to be the home planet of the Harkonnens
Dune: House Harkonnen, the second book in the Prelude to Dune series, written by Brian Herbert and Kevin J. Anderson
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House Harkonnen, the fictional noble family in the Dune series of novels and films
Suk doctor Wellington Yueh, the Bene Gesserit Lady Jessica and Harkonnen enemies Duncan Idaho and Gurney Halleck ally themselves with Leto, and Shaddam nearly destroys the all-important planet Arrakis thinking he has found a replacement for its priceless and essential export, melange.
"Dune: A Whisper of Caladan Seas" takes place during the Harkonnen attack on Arrakis during the course of the original Dune by Frank Herbert.
The same mantra is also recited by the Harkonnen Mentat Hayt in the beginning of the House's campaign in the Dune 2000 (1998) video game before briefing the player on the first mission.