Gurgustius (Welsh: Gorust) was a legendary king of the Britons as accounted by Geoffrey of Monmouth. 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.
- Geoffrey of Monmouth: The History of the Kings of Britain : an Edition and Translation of De Gestis Britonum (Historia Regum Britanniae), Boydell & Brewer, 1 Jan 2007, p.44.
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