Gurgustius () was a legendary king of the Britons as accounted by Geoffrey of Monmouth. He came to power in 788BC.
He was the son of King Rivallo and was succeeded by Sisillius I, and then Jago, who was Gurgustius' nephew. Geoffrey has nothing to say of him beyond this.
The "Book of Baglan" (1600–1607) gives Gurgustius' name as Gorwst, and states that his second son, Antonius, was Duke of Cornwall.
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