Jago (; sometimes Jaygo; James in English) was a legendary king of the Britons in Geoffrey of Monmouth's . The Latin text describes him as the ('nephew' or 'grandson') of Gurgustius, and while the majority of translators and scholars interpret this as meaning Gurgustius' nephew, some call him his grandson instead. He succeeded Gurgustius' son Sisillius I to the throne and was succeeded by Sissillius' son Kimarcus.Monarchie Nobelesse website, Bretons Geoffrey has nothing more to say of him.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.
The Latin text of the describes him as: "" ('Iago, of Gurgustius'). The word can mean "nephew" or "grandson". In this case it is generally interpreted to mean "nephew", but the Black Book of Basingwerk defines him as the son of Sisillius I, and so grandson of Gurgustius, and Michael A. Faletra's 2007 translation calls him "Iago, the grandson of Gurgustius".
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